BHI Inflammation by Heel, Inc. (formerly known as BHI)

POSSIBLY EFFECTIVE

• Osteoarthritis. Topical arnica gel might reduce osteoarthritis pain. Details: One open-label clinical trial shows that applying arnica gel (A. Vogel Arnica Gel, Bioforce AG) twice daily for 3 weeks decreases total symptom scores, including pain, stiffness, and restriction-of-function, when compared to baseline (19112). A larger randomized clinical trial shows that applying the same gel is as effective as ibuprofen for reducing the intensity of pain and improving hand function (19108).

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Acne. Although there is interest in using topical arnica for acne, there is insufficient reliable information about the clinical effects of arnica for this purpose.
• Bleeding. It is unclear if oral arnica reduces bleeding after surgery. Details: A small clinical study in patients undergoing total mastectomy for breast cancer suggests that sublingual treatment with 5 drops of a homeopathic preparation of arnica extract (Arnica 1000 K) three times daily for 6 days might reduce the volume of blood and serum drainage by 95 mL over 5 days when compared with placebo (96769). However, because this product is a dilute homeopathic preparation, there is unlikely to be any arnica in the doses given. There is speculation that the slightly higher mean weight of the patients in the arnica group, rather than any effects of arnica itself, might have led to the statistically significant findings (96768).
• Breast cancer-related hot flashes. Oral homeopathic arnica has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: A clinical study in females with non-metastatic breast cancer treated with tamoxifen or an aromatase inhibitor shows that taking a specific homeopathic medicine (Actheane, Laboratories Boiron) daily for 3 months does not reduce hot flashes when compared with placebo. This product contains 4CH each of arnica, black cohosh, bloodroot, and nitroglycerin and 5CH of snake Lachesis muta (103004).
• Bruises. Most small clinical trials show that neither topical nor oral arnica reduces postoperative bruising. Details: Most clinical research shows that topical products containing arnica 10%, as well as homeopathic oral products such as tablets, globules, and capsules, are not effective for reducing postoperative bruising (19107,19119,19120,19121,19122,19123,19124,90611,96769,96772). However, some conflicting research shows benefit. One clinical study shows that applying arnica 20% ointment 0.25 grams twice daily for 2 weeks reduces laser-induced bruising when compared to white petrolatum ointment (19125). Another clinical study shows that applying a specific arnica cream (Arnica Krem 75 g, MediTech) four times daily reduces periorbital bruising in the first week after rhinoplasty when compared with no local treatment (96773). One small study has also evaluated oral homeopathic arnica. In females undergoing a face-lift, taking a specific homeopathic oral arnica product (SinEcch, Alpine Pharmaceuticals) may reduce bruising on postoperative days 1 and 7 when compared with placebo (19124).
• Diabetic retinopathy. Small clinical studies suggest that oral homeopathic arnica may reduce symptoms of diabetic retinopathy. Details: Two preliminary clinical trials in patients with diabetic retinopathy associated with both type 1 and type 2 diabetes shows that taking three pearls of homeopathic arnica 5C orally for 6 months might modestly improve measures of vision when compared with placebo (19110,19111).
• Dry eye. It is unclear if eye drops containing arnica extract can improve dry eye in children. Details: A small observational study in children aged 9-14 years with dry eye disease and allergic conjunctivitis suggests that applying eye drops containing hyaluronic acid 0.2% and arnica extract 0.1% three times daily for four weeks is associated with improvements in subjective and objective measures of dry eye severity when compared to baseline. Improvements in these outcomes were smaller and mostly non-significant in patients using eye drops containing hyaluronic acid only (111421). The validity of these findings is limited by a lack of between-group analysis and randomization.
• Exercise-induced muscle soreness. Small studies suggest that oral homeopathic arnica does not reduce muscle soreness after exercise. It is unclear if topical arnica is beneficial. Details: Despite some conflicting evidence (19135), most clinical research shows that taking homeopathic arnica formulations orally does not prevent delayed-onset muscle soreness (19129,19130,19131,19132,19133). Research on the use of topical arnica formulations is conflicting. One small study in trained athletes shows that using a gel containing 25 mg of dry arnica herb on muscles immediately after a run and then every 4 hours while awake for 5 days improves muscle tenderness and pain by a small amount after 3 days, but not at other time points, when compared with placebo (90612). However, another small study suggests that applying arnica 7% cream (Boiron Group) increases muscle pain following calf raises when compared with placebo (17113).
• Postoperative swelling. It is unclear if topical arnica reduces swelling after surgery. Details: One clinical study shows that applying arnica 10% ointment following blepharoplasty does not reduce postoperative swelling when compared with using a placebo ointment (96772). However, lower quality studies have yielded more promising results. One small clinical study shows that applying a specific arnica cream (Arnica Krem 75 g, MediTech) four times daily reduces swelling by a small amount in the first week after rhinoplasty when compared with no local treatment (96773). The validity of this finding is limited by the lack of a placebo control. A small retrospective study suggests that using a topical homeopathic preparation containing arnica 50M and marsh tea 50M (OcuMend, Cearna Inc.) is associated with reduced postoperative swelling after oculofacial surgery (96770); however, this study is limited by poor design (96771).
• Postoperative pain. Findings related to the use of oral homeopathic arnica are mixed; most studies utilizing a placebo control have yielded negative results. Details: Many small clinical studies show that taking homeopathic arnica preparations orally modestly reduces postoperative pain following tonsillectomy, knee surgery, and carpal tunnel release when compared with baseline or control. Most studies have used homeopathic arnica in dilutions of 30C, 30X, D6, or D4, for up to two weeks postoperatively (19102,19114,19115,19116). In one study, oral homeopathic arnica has been used along with arnica 5% ointment from 72 hours after surgery for up to 2 weeks (19116). The validity of these findings is limited by the lack of a placebo comparator. Studies utilizing a placebo or active control have not yielded positive results. Clinical research in patients recovering from carpal tunnel surgery shows that taking a homeopathic Arnica montana solution by mouth is no more effective than taking placebo for reducing postoperative pain and bruising (19107). Other clinical research shows that taking homeopathic arnica 30C for 5 days after total abdominal hysterectomy does not reduce postoperative pain when compared with placebo and usual treatment (19117). Also, homeopathic arnica D4 is inferior to diclofenac following bunion surgery (109102). Some clinical research in patients recovering from a knee ligament reconstruction shows that a homeopathic solution containing Arnica montana 5 CH, Bryonia alba 5 CH, Hypericum perforatum 5 CH, and Ruta graveolens 3 DH is no more effective than placebo for reducing analgesic use (32413).
• Postoperative recovery. It is unclear if oral homeopathic arnica is beneficial for postoperative recovery. Details: One meta-analysis of small- to moderate-sized clinical trials shows that taking homeopathic arnica does not improve postoperative recovery when compared with controls. Recovery endpoints were combined and included pain, swelling, bruising, wound healing, and others (109061).
• Stroke. A small study suggests that oral homeopathic arnica does not improve outcomes after stroke. Details: Preliminary clinical research shows that taking one tablet of arnica 30C sublingually every 2 hours for six doses doesn't benefit stroke patients (19126). Endpoints included level of consciousness, mobility, incontinence, social performance, and mental state.
• Tooth extraction. It is unclear if oral homeopathic arnica improves symptoms after tooth extraction in adults or children. Details: A small clinical trial in children aged 8-12 years undergoing two sessions of tooth extraction in different parts of the mouth shows that taking homeopathic arnica 30 minutes prior to the procedure, and then 3 times daily for 72 hours, is as effective as taking ibuprofen for reducing patient-reported and operator-assessed pain levels 24 hours after extraction. However, 48 hours after extraction, ibuprofen was more effective. Each child was provided with both arnica and weight-based doses of ibuprofen in a crossover manner while undergoing two sessions of tooth extraction in different parts of the mouth ten days apart (109224). A small observational study in adults undergoing third molar extractions suggests that taking homeopathic arnica 30X (Hyland's Inc.) 4 tablets before the procedure and then 4 tablets four times daily for 4 days after the procedure is associated with less pain, bleeding, and swelling when compared with standard treatment alone (105062). However, the validity of this study is limited by the lack of a placebo control. More evidence is needed to rate arnica for these uses.

(Read more about ARNICA)

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Asthma. Although there is interest in using oral belladonna for asthma, there is insufficient reliable information about the effects of belladonna for this condition.
• Common cold. Although there is interest in using oral belladonna for the common cold, there is insufficient reliable information about the effects of belladonna for this condition.
• Hemorrhoids. Although there is interest in using rectal belladonna for hemorrhoids, there is insufficient reliable information about the effects of belladonna for this condition.
• Irritable bowel syndrome (IBS). It is unclear if oral belladonna is beneficial in patients with IBS. Details: A prescription-only oral combination of belladonna and phenobarbital, first marketed prior to the passing of the Food, Drug, and Cosmetic Act of 1938, is considered an unapproved drug, but is allowed to remain on the market while the FDA evaluates its effectiveness and safety (106908). However, preliminary clinical research suggests that taking a combination of belladonna and phenobarbital orally for one month does not improve symptoms of IBS when compared with placebo (34156).
• Kidney stones (nephrolithiasis). It is unclear if rectal belladonna is beneficial in patients with ureteral spasm associated with kidney stones. Details: A prescription-only rectal combination of belladonna and opium, first marketed prior to the passing of the Food, Drug, and Cosmetic Act of 1938, is considered an unapproved drug, but is allowed to remain on the market while the FDA evaluates its effectiveness and safety (106909). Clinical trials for this indication have not been published, and clinical data are not included in the package insert.
• Parkinson disease. Although there is interest in using oral belladonna for Parkinson disease, there is insufficient reliable information about the effects of belladonna for this condition.
• Rheumatoid arthritis (RA). Although there is interest in using topical belladonna for RA, there is insufficient reliable information about the effects of belladonna for this condition. More evidence is needed to rate belladonna for these uses.

(Read more about BELLADONNA)

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Acne. Although there has been interest in using oral bittersweet nightshade stem for acne, there is insufficient reliable information about the clinical effects of bittersweet nightshade for this purpose.
• Atopic dermatitis (eczema). Although there has been interest in using oral or topical bittersweet nightshade stem for eczema, there is insufficient reliable information about the clinical effects of bittersweet nightshade for this purpose.
• Furuncles (boils). Although there has been interest in using oral bittersweet nightshade stem for boils, there is insufficient reliable information about the clinical effects of bittersweet nightshade for this purpose.
• Warts. Although there has been interest in using oral bittersweet nightshade stem for warts, there is insufficient reliable information about the clinical effects of bittersweet nightshade for this purpose.
• Wound healing. Although there has been interest in using oral bittersweet nightshade stem for abrasions, there is insufficient reliable information about the clinical effects of bittersweet nightshade for this purpose. More evidence is needed to rate bittersweet nightshade for these uses.

(Read more about BITTERSWEET NIGHTSHADE)

There is insufficient reliable information available about the effectiveness of bryonia.

(Read more about BRYONIA)

POSSIBLY EFFECTIVE

• Common cold. Taking echinacea orally while still healthy may help prevent the common cold, but the benefit is probably modest. Echinacea does not seem to have a significant benefit for treating colds that have already developed. Details: Three meta-analyses show a 10% to 58% reduction in the risk of developing a cold when taking various forms of echinacea (17520,17522,95652). A large clinical study shows that adults who use a specific echinacea extract (Echinaforce, A. Vogel Bioforce AG) 0.9 mL three times daily (2400 mg echinacea daily) for 4 months, with an increase to 0.9 mL five times daily (4000 mg echinacea daily) at the first sign of a cold, have 59% fewer cold episodes and 26% fewer days with cold symptoms than those taking placebo (18225). Many smaller studies have shown a non-significant trend toward a prophylactic benefit, but they were likely underpowered to detect a statistically significant difference (3282,6386,17521,95652). Research in adults who are deliberately infected with cold viruses shows that taking echinacea products either does not reduce the incidence of colds, or has a limited effect which is not statistically significant. Products used include E. angustifolia root extract 300 mg three times daily for 7 days before and 5 days after experimental infection (13419), an alcoholic extract of E. purpurea above-ground parts (EchinaGuard, Madaus AG) 2.5 mL three times daily for 7 days before and 7 days after experimental infection (12354), or echinacea 300 mg three times daily for 14 days before and 5 days after experimental infection (8228). These studies are small and have methodological problems. Some small clinical studies have suggested that taking E. purpurea extracts as a tincture or tea to treat the common cold modestly reduces symptom severity and reduces cold duration by a couple of days (6384,10320,10802,12355,14419,20062,111530). Specific products used in these studies include Echinilin by Inovobiologic Inc., and Echinacin and EchinaGuard by Madaus AG (10320,10802,12355,20062). In contrast, higher quality clinical research shows that taking E. purpurea alone or with E. angustifolia does not reduce duration or severity of cold symptoms when compared with placebo (10800,11970,17519,20059). Echinacea has also been evaluated in children. Preliminary clinical research in healthy children 4-12 years old shows that taking a specific E. purpurea product (Echinaforce Junior, A. Vogel) 400 mg three times daily for 4 months reduces the occurrence of cold symptoms, respiratory complications (such as pneumonia and otitis media), and antibiotic prescriptions by 30%, 52%, and 62%, respectively, when compared with vitamin C 50 mg three times daily. Taking echinacea also reduces the average duration of symptoms during respiratory illness by an average of 1.4 days when compared with vitamin C (105719). However, other clinical research in children has found no benefit with a specific E. purpurea product (Echinacin, Madaus AG) (4989,95653).

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Anxiety. It is unclear if oral echinacea reduces anxiety. Details: Preliminary clinical research shows that taking a specific E. angustifolia extract (ExtractumPharma ZRT) 40 mg once or twice daily for 7 days reduces anxiety scores on the State-Trait Anxiety Inventory scale when compared with placebo (20064,103233). This extract seems to be more effective in patients with high baseline anxiety scores (103233). A lower dose of 20 mg daily appears to be ineffective (20064). Conversely, a small clinical study in physically healthy adults with mild to moderate anxiety shows that taking the same E. angustifolia extract at doses of 20 or 40 mg twice daily for 6 weeks does not reduce anxiety when compared with placebo (106626).
• Athletic performance. It is unclear if oral echinacea improves athletic performance in healthy, recreationally active males. Details: Preliminary clinical research in healthy, recreationally active males shows that taking echinacea (Puritan's Pride) 2 grams four times daily for 28 days increases serum erythropoietin levels and maximal oxygen consumption (VO2max) during exercise tests (20066). However, two small clinical studies in endurance trained athletes and in non-athletes with high aerobic fitness show that taking E. purpurea 8 or 16 grams once daily for 35 days in combination with other ingredients (Biomedical Research Lab), or taking E. purpurea (Puritan's Pride) 8 grams daily for 42 days, has no effect on erythropoietin levels, VO2max, or aerobic capacity (95651,101593).
• Atopic dermatitis (eczema). Some evidence shows that an echinacea cream may be effective in mild disease, but it has not been compared to conventional treatments such as corticosteroids. Details: Preliminary clinical research in patients with mild atopic dermatitis shows that applying a cream containing echinacea (Linola Plus Cream, Dr. August Wolff GmbH & Co) 2-3 times daily for 12 weeks reduces symptoms such as erythema, edema, pruritus, and dryness when compared with a cream containing birch bark extract (Imlan Crème Pur, Birken AG). However, the echinacea product was no different to the comparator cream at the 4- and 8-week assessments, indicating that it might take up to 12 weeks to show benefit (97499).
• Attention deficit-hyperactivity disorder (ADHD). Although there has been interest in using oral echinacea for ADHD, there is insufficient reliable information about the clinical effects of echinacea for this purpose.
• Burns. Although there has been interest in using topical echinacea for burns, there is insufficient reliable information about the clinical effects of echinacea for this purpose.
• Chronic fatigue syndrome (CFS). Although there has been interest in using oral echinacea for CFS, there is insufficient reliable information about the clinical effects of echinacea for this purpose.
• Coronavirus disease 2019 (COVID-19). It is unclear if oral echinacea is beneficial for preventing or treating COVID-19. Details: A moderate-size open-label clinical study tested the effects of echinacea to prevent or treat respiratory viruses. This study of otherwise healthy adults in Bulgaria shows that taking echinacea extract (Echinaforce, A. Vogel AG) 2400 mg daily for cycles of 2, 2, and 1 months, with a 1-week break between each cycle, does not reduce symptomatic respiratory tract infections, including SARS-CoV-2, or respiratory virus detection overall when compared with usual care. However, echinacea extract does reduce the risk of a positive test for coronaviruses or SARS-CoV-2 by 48% and 63%, respectively. In patients who develop a symptomatic respiratory tract infection, this study also shows that taking the same echinacea extract 4000 mg daily for up to 10 days speeds viral clearance compared with usual care when all virus types were analyzed; however, clearance of SARS-CoV-2 was not improved. Echinacea may also reduce the number of days with a fever, but not other symptoms (111174). The validity of this study is limited by lack of blinding. Further, most patients were unvaccinated against COVID-19; it is unclear whether these results can be extrapolated to vaccinated patients.
• Genital herpes. It is unclear if oral echinacea is beneficial for genital herpes in patients with herpes simplex virus (HSV) type 1 or 2. Details: Some clinical research shows that a specific E. purpurea extract (Echinaforce, A. Vogel Bioforce AG) 800 mg orally twice daily for 6 months does not seem to prevent or reduce the frequency or duration of recurrent genital herpes in patients with herpes simplex virus (HSV) type 1 or 2 (7087).
• Gingivitis. Echinacea, in a mouth rinse or periodontal patch, has only been studied in combination with other ingredients; its effect when used alone is unclear. Details: Preliminary clinical research shows that using a mouth rinse containing echinacea, gotu kola, and elderberry (HM-302, Izun Pharmaceuticals) 15 mL three times daily for 14 days might prevent worsening of gingivitis when compared with a placebo rinse, but it produces only minimal improvement in symptoms (20069). Applying a periodontal patch containing echinacea, gotu kola, and elderberry (PerioPatch, Izun Pharmaceuticals) either as a single dose, or three times daily for 1 day then once daily for 2 days seems to reduce some measures of inflammation and gingivitis at some time points, but effects lack consistency (20068,20070).
• Herpes labialis (cold sores). Although there has been interest in using topical echinacea for herpes labialis, there is insufficient reliable information about the clinical effects of echinacea for this purpose.
• HIV/AIDS. Although there has been interest in using oral echinacea for HIV/AIDS, there is insufficient reliable information about the clinical effects of echinacea for this purpose.
• Human papillomavirus (HPV). Oral echinacea has only been studied in combination with other ingredients; its benefit when used alone is unclear. Details: Preliminary clinical research shows that taking a specific combination product containing echinacea, andrographis, grapefruit, papaya, pau d'arco, and cat's claw (Immune Act, Erba Vita SpA) three tablets daily for one month reduces the recurrence of anal condylomata in patients following surgical removal. After one month, the recurrence rate was about 4% in the echinacea group compared with 18% in the control group; after 6 months the recurrence rates were about 7% and 27%, respectively (20073). However, poor study methodology limits the validity of these findings.
• Influenza. Limited data suggest that oral echinacea may improve the response to influenza vaccine, and that a combination product containing echinacea may improve rates of recovery from influenza. Details: Preliminary clinical research shows that a taking a specific echinacea product (Monoselect Echinacea, PharmExtracta) 200 mg orally daily for 15 days, then 100 mg daily for 15 days, followed by 100 mg every other day for 60 days, might improve the response to influenza vaccine in people with chronic bronchitis or asthma (18226). Higher quality research is needed to confirm these results. Taking a specific combination product (Echinaforce Hot Drink, A. Vogel Bioforce AG), containing elderberry juice and extracts of E. purpurea above-ground parts and roots, 5 mL five times daily for 3 days, then three times daily for 7 days, improves rates of recovery and influenza-related respiratory complications similarly to oseltamivir 75 mg twice daily for 5 days (95650). However, due to the lack of a placebo group, it is unclear if both treatments were beneficial or if the outcomes represent the natural progression of influenza.
• Insect bite. It is unclear if topical homeopathy with a gel containing echinacea is beneficial for insect bite treatment. Oral echinacea has not been evaluated for this use. Details: Preliminary clinical research shows that using a homeopathic after-bite gel, containing echinacea, marsh Labrador tea, and stinging nettle, on affected areas does not reduce erythema or itching after a mosquito bite when compared with placebo (89235).
• Lichen planus. It is unclear if oral echinacea is beneficial for patients with this condition. Details: A small clinical study in adults with erosive oral lichen planus in Iran shows that taking a specific echinacea extract tablet (Immustim, Goldaru Corp.) 114 mg three times daily for 35 days decreases pain scores, number of lesions, and symptom severity when compared with placebo. However, all patients also used a mouthwash containing betamethasone, diphenhydramine, nystatin, and aluminum-magnesium suspension three times daily (111173).
• Malaria. Although there has been interest in using oral echinacea for malaria, there is insufficient reliable information about the clinical effects of echinacea for this purpose.
• Migraine headache. Although there has been interest in using oral echinacea for migraine headache, there is insufficient reliable information about the clinical effects of echinacea for this purpose.
• Otitis media. Oral echinacea does not seem to reduce the rate of recurrence of otitis media in young children, and may actually increase it. Details: Preliminary clinical research shows that taking a specific liquid extract of echinacea fresh roots and dried mature seeds, 0.5 mL three times daily for 3 days at the first sign of a common cold, followed by 0.25 mL three times daily for 7 days, does not prevent otitis media in children 1-5 years of age with a history of recurrent otitis media. In fact, the risk of an episode of otitis media during the 6 month follow-up seemed to increase by 59% in those taking echinacea when compared with placebo (20063).
• Psoriasis. Although there has been interest in using topical echinacea for psoriasis, there is insufficient reliable information about the clinical effects of echinacea for this purpose.
• Respiratory tract infections. It is unclear if oral echinacea is beneficial for patients with respiratory tract infections. Details: A large clinical study in adults with respiratory tract infections shows that using echinacea spray or taking echinacea lozenges 16,800 mg daily during days 1-3 and 2240-3360 mg daily afterward for up to 10 days does not improve time to recovery, symptom relief, or number of sick days when compared with echinacea tablets or drops at a prophylactic dose of 2400 mg daily for 10 days. However, the higher dose from days 1-3 is associated with faster viral clearance than the prophylactic dose (111540). The validity of these effects is limited by insufficient blinding and a lack of a placebo group.
• Rheumatoid arthritis (RA). Although there has been interest in using oral echinacea for RA, there is insufficient reliable information about the clinical effects of echinacea for this purpose.
• Tonsillitis. Oral echinacea has been used with azithromycin to reduce relapses of recurrent tonsillitis in children. A throat spray containing echinacea has also been evaluated for tonsillitis-associated sore throat. It is unclear if echinacea is beneficial for either purpose. Details: Preliminary clinical research in children with recurrent tonsillitis shows that adding echinacea suspension, 250 mg root powder per 5 mL, orally 3 times daily for 10 consecutive days per month for 6 months, to azithromycin 10 mg/kg/day for 6 consecutive days per month for 6 months reduces the number of tonsillitis attacks when compared with azithromycin alone (104127). However, the study was not blinded and the number of tonsillitis episodes in both groups was very low. Other preliminary clinical research shows that applying a throat spray containing sage and echinacea whole plant extract every 2 hours up to 10 times daily for up to 5 consecutive days is as effective as a chlorhexidine-lidocaine spray in patients with sore throat due to acute pharyngitis or tonsillitis (20077).
• Tonsillopharyngitis. Oral echinacea has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: A moderate-sized study in patients aged 12-75 years with acute tonsillopharyngitis shows that taking lozenges containing echinacea extract 800 mg and sage extract 5 times daily for 4 days reduces throat pain and tonsillopharyngitis symptoms when compared to baseline, both acutely within 90 minutes and after 4 days of treatment (111530). The validity of these effects is limited by a lack of a comparator group. It is unclear if these effects are due to echinacea, sage, or the combination.
• Upper respiratory tract infection (URTI). It is unclear if oral echinacea is beneficial for preventing or treating URTIs. Details: A moderate-size open-label clinical study tested the effects of echinacea to prevent or treat respiratory viruses. This study of otherwise healthy adults in Bulgaria shows that taking echinacea extract (Echinaforce, A. Vogel AG) 2400 mg daily for cycles of 2, 2, and 1 months, with a 1-week break between each cycle, does not reduce symptomatic respiratory tract infections, including SARS-CoV-2, or respiratory virus detection overall when compared with usual care. However, echinacea extract does reduce the risk of a positive test for coronaviruses or SARS-CoV-2 by 48% and 63%, respectively. In patients who develop a symptomatic respiratory tract infection, this study also shows that taking the same echinacea extract 4000 mg daily for up to 10 days speeds viral clearance compared with usual care when all virus types were analyzed; however, clearance of SARS-CoV-2 was not improved. Echinacea may also reduce the number of days with a fever, but not other symptoms (111174). The validity of this study is limited by lack of blinding. Further, most patients were unvaccinated against COVID-19; it is unclear whether these results can be extrapolated to vaccinated patients. Another large study in adults with URTIs shows that taking a combination product containing echinacea 1100-2200 mg, zinc, and vitamin C (EZC Pak) daily for 5 days reduces time to recovery by 1.4 days but does not reduce symptom severity when compared with placebo (111512). The validity of these effects is severely limited by multiple instances of selection bias. Additionally, it is unclear if these effects are due to echinacea, other ingredients, or the combination.
• Urinary tract infections (UTIs). Although there has been interest in using oral echinacea for UTIs, there is insufficient reliable information about the clinical effects of echinacea for this purpose.
• Vaginal candidiasis. Although there has been interest in using oral echinacea for vaginal candidiasis, there is insufficient reliable information about the clinical effects of echinacea for this purpose.
• Warts. It is unclear if oral echinacea is beneficial for warts when used alone or in combination with other ingredients. Details: Preliminary clinical research shows that taking echinacea 600 mg orally once daily for up to 3 months does not clear common, plantar, or plain cutaneous warts any more effectively than placebo (20080). Other preliminary clinical research shows that taking an oral supplement containing echinacea with methionine, zinc, probiotics, antioxidants and immunostimulants for 6 months, in addition to using conventional topical therapy to treat cutaneous warts, seems to increase the rate of complete remission from 54% to 86% when compared with conventional therapy alone (20071). It is unclear if these effects are due to echinacea, other ingredients, or the combination.
• Water warts. It is unclear if oral echinacea is beneficial for water warts (molluscum contagiosum). Details: In children who have been successfully treated with curettage for molluscum contagiosum, taking a combination of E. angustifolia and E. purpurea orally daily for 2 months is associated with a relapse rate of about 39%, compared with a rate of 68% in a control group that received no oral treatment (104128). The validity of this finding is limited by the lack of a placebo control. E. angustifolia and E. purpurea were taken in doses of 200 mg each in children under 20 kg and 400 mg each in children over 20 kg. More evidence is needed to rate echinacea for these uses.

(Read more about ECHINACEA)

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Back pain. Topical poison ivy has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Preliminary clinical research in patients with acute low back pain shows that a specific homeopathic gel (Spiroflor SRL) containing poison ivy, comfrey, and marsh Labrador tea in a 1:2:1 ratio might work as well as capsaicin cream for reducing pain (40358).
• Osteoarthritis. Topical poison ivy has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Preliminary clinical research in patients with osteoarthritis shows that use of a homeopathic gel containing poison ivy, marsh Labrador tea, and comfrey, 1 gram three times daily for 4 weeks, is as effective as a 5% piroxicam gel for reducing pain (89245).
• Pain (acute). Although there has been interest in using oral homeopathic preparations of poison ivy for acute pain, there is insufficient reliable evidence about the clinical effects of poison ivy for this purpose.
• Pruritus. Although there has been interest in using oral homeopathic preparations of poison ivy for pruritic skin conditions, there is insufficient reliable evidence about the clinical effects of poison ivy for this purpose.
• Rheumatoid arthritis (RA). Although there has been interest in using oral homeopathic preparations of poison ivy for RA, there is insufficient reliable evidence about the clinical effects of poison ivy for this purpose.
• Sprains. Although there has been interest in using oral homeopathic preparations of poison ivy for sprains, there is insufficient reliable evidence about the clinical effects of poison ivy for this purpose. More evidence is needed to rate poison ivy for these uses.

(Read more about POISON IVY)

There is insufficient reliable information available about the effectiveness of pokeweed.

(Read more about POKEWEED)

There is insufficient reliable information available about the effectiveness of pulsatilla.

(Read more about PULSATILLA)

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Common cold. Clinical research in patients with moderate cold symptoms shows that taking three tablets of a specific combination product (Esberitox, Schaper & Brümmer GmbH & Co. KG) containing dry extracts of echinacea root, thuja leaf, and wild indigo root three times daily for 7-9 days improves the severity of cold symptoms, general well-being, and overall response rate when compared with placebo (6392). It is unclear if these effects are due to thuja leaf, the other ingredients, or the combination. More evidence is needed to rate thuja for this use.

(Read more about THUJA)

POSSIBLY SAFE ...when used orally in amounts commonly found in foods. Arnica has Generally Recognized As Safe (GRAS) status for use as a food flavoring in the US (4912). However, Canadian regulations do not allow its use as a food ingredient (12). ...when used orally in homeopathic dilutions of 30C and up to 5C (19110,19111,19117,19124,19126,96769). ...when used topically on unbroken skin, short-term (12).

LIKELY UNSAFE ...when used orally or when applied topically to broken skin. Arnica is considered poisonous and has caused severe or fatal poisonings (5). Arnica can cause gastroenteritis, muscle paralysis, bleeding, arrhythmia, hypertension, shortness of breath, nausea and vomiting, multi-organ failure, and death (4,5,17,104,19101,19102,19103,19104,19105,19106,19107,19108).

PREGNANCY AND LACTATION: LIKELY UNSAFE
when used orally or topically; avoid using (12).

(Read more about ARNICA)

POSSIBLY UNSAFE ...when used rectally. It is not known whether significant amounts of the toxic alkaloids are absorbed from the rectum (106909). ...when used topically. It is not known whether significant amounts of the toxic alkaloids are absorbed through the skin (106909).

LIKELY UNSAFE ...when used orally. Belladonna contains toxic alkaloids and has been linked to reports of serious adverse effects (12,553,34144).

CHILDREN: LIKELY UNSAFE
when used orally. Fatalities in children may occur at doses of belladonna providing atropine 0.2 mg/kg (34168). Two belladonna berries, which contain 2 mg atropine per fruit, may be lethal for a small child (34144). Severe adverse effects and fatalities have been reported in infants treated with topical homeopathic teething products containing belladonna (17493,34142,34146,93537).

PREGNANCY: LIKELY UNSAFE
when used orally. Belladonna contains toxic alkaloids and has been linked to reports of serious adverse effects (12,553,34144).

LACTATION: LIKELY UNSAFE
when used orally. Belladonna can reduce milk production and is secreted into breast milk (15).

(Read more about BELLADONNA)

POSSIBLY SAFE ...when the stem is used orally or topically and appropriately (2,18).

LIKELY UNSAFE ...when the leaves or berries are used orally. The plant contains the toxic compounds solanine, solanidine, and dulcamarin (6).

CHILDREN: LIKELY UNSAFE
when used orally; unripe berries have caused poisonings. A lethal dose is estimated to be 200 berries (18). There is insufficient reliable information available about the safety of bittersweet nightshade when used topically in children; avoid using.

PREGNANCY: LIKELY UNSAFE
when used orally. The alkaloids of the plant, solasodine, soladulcine, and related compounds have been linked to birth defects in animals (6); avoid using. There is insufficient reliable information available about the safety of bittersweet nightshade when used topically during pregnancy; avoid using.

LACTATION: LIKELY UNSAFE
when orally; avoid using. There is insufficient reliable information available about the safety of bittersweet nightshade when used topically; avoid using.

(Read more about BITTERSWEET NIGHTSHADE)

LIKELY UNSAFE ...when the root or berries are used orally (2,18). Consuming 40 berries might be fatal (18).

CHILDREN: LIKELY UNSAFE
when the root or berries are used orally (2,18). Consuming as few as 15 berries can be fatal in children (18).

PREGNANCY: UNSAFE
when the root is used orally. Bryonia root might have abortifacient effects (2). ...when the berries are used orally (2).

LACTATION: LIKELY UNSAFE
when the root or berries are used orally (2).

(Read more about BRYONIA)

LIKELY SAFE ...when used orally and appropriately, short-term. Various liquid extracts of Echinacea purpurea have been used safely for up to 10 days, including EchinaGuard (Madaus AG) 20 drops every 2 hours for 1 day, then three times daily (10320), or Echinilin (Inovobiologic Inc.) 40 mL in divided doses for 1 day, then 15 mL in divided doses daily thereafter (12355,20062). Other liquid extracts have been used safely for relatively longer periods, including Echinaforce (A. Vogel Bioforce AG) 2.4 grams daily for 4 months or 1.6 grams daily for 6 months (7087,18225), and Echinacin (Madaus AG) 5 mL twice daily for 10 days, or 4 mL twice daily for 8 weeks (3282,10802). Specific solid dosage forms of echinacea that have been used safely for up to 10 days include Echinacea purpurea above-ground parts (EchinaFresh, Enzymatic Therapy) 300 mg daily (11970), and mixtures of Echinacea purpurea and Echinacea angustifolia herb in divided doses of 6 grams to 10.5 grams for 1 day then 3 grams to 5.1 grams daily (10800,17519,20059). A specific Echinacea angustifolia extract (ExtractumPharma ZRT) has also been used with apparent safety at a dose of 40 mg once or twice daily for up to 7 days (20064,103233). An Echinacea purpurea product (Natures Resource) has been used safely at a dose of 1.8 grams daily for 8 weeks (17521), and echinacea (Puritan's Pride) has been used safely at 8 grams daily for 28 days (20066).

POSSIBLY SAFE ...when used topically, short-term. A specific cream (Linola Plus Cream, Dr. August Wolff GmbH & Co.) containing echinacea extract (WO 3260) has been applied to the skin safely 2-3 times daily for up to 12 weeks (97499). There is insufficient reliable evidence about the safety of echinacea when used parenterally.

CHILDREN: POSSIBLY SAFE
when used orally, short-term. Some clinical research shows that an extract of the above-ground parts of Echinacea purpurea (EC31J2, Echinacin Saft, Madaus AG) in a dose of 3.75 mL twice daily (for ages 2 years to 5 years) or 7.5 mL twice daily (for ages 6 years to 11 years) is safe when used for up to 10 days (4989). However, about 7% of children experienced a rash after taking echinacea, which might have been caused by an allergic reaction (4989). There is concern that allergic reactions could be severe in some children. The Medicines and Healthcare Products Regulatory Agency in the United Kingdom recommends against the use of oral echinacea products in children under 12 years of age due to this risk of allergic reaction (18207). In contrast, another clinical study in children 4-12 years old shows that a specific Echinacea purpurea product (Echinaforce Junior, A. Vogel) does not cause allergic or urticarial reactions more frequently than vitamin C (105719).

PREGNANCY: POSSIBLY SAFE
when used orally, short-term. There is preliminary evidence that mothers can safely use echinacea in the form of E. purpurea or E. angustifolia solid dosage forms, 250-1000 mg daily, or tinctures, up to 30 drops daily, for 5 days to 7 days during the first trimester without adversely affecting the fetus (7056,13418,15123). There is insufficient reliable information available about the safety of echinacea when used for longer than 7 days.

LACTATION:
Insufficient reliable information available; avoid using.

(Read more about ECHINACEA)

LIKELY UNSAFE ...when used orally or topically (6). Poison ivy is highly irritant and allergenic (68970).

PREGNANCY AND LACTATION: LIKELY UNSAFE
when used orally or topically (6); avoid using.

(Read more about POISON IVY)

LIKELY UNSAFE ...when pokeweed is used orally. All parts of the pokeweed plant, especially the root, are considered to be toxic (3477,3479). The Herb Trade Association recommends against selling pokeweed as an herbal beverage or food (3478). Severe poisoning has been reported from ingesting tea brewed from pokeweed root (3478) and pokeweed leaves (3480,69094). Poisoning also has resulted from ingestion of pokeberry wine and pokeberry pancakes (3479). Consuming just 10 berries can be toxic to an adult (6). Green berries are considered more toxic than mature, red berries (4). ...when applied topically to the skin. Skin contact can cause hematological changes (3477,3481,3482). Protective gloves should be used to handle the plant (3477).

CHILDREN: UNSAFE
when used orally. Children have died after ingesting pokeweed berries. Consumption of even one berry can be toxic (3479).

PREGNANCY AND LACTATION: LIKELY UNSAFE
when pokeweed is used orally or applied topically; avoid using. Evidence suggests the pokeweed berry has uterine stimulant and abortifacient effects (4,19). Pokeweed is generally considered unsafe for any use.

(Read more about POKEWEED)

LIKELY UNSAFE ...when fresh above ground parts are used orally or topically; pulsatilla is a severe local irritant (4). There is insufficient reliable information available about the safety of the use of dried pulsatilla.

PREGNANCY: LIKELY UNSAFE
when used orally. The fresh or dried above ground parts are contraindicated due to abortifacient and teratogenic effects (2,4). ...when the fresh above ground parts are used topically. There is insufficient reliable information available about the safety of topical dried pulsatilla during pregnancy.

LACTATION: LIKELY UNSAFE
when the fresh above ground parts are used for oral or topical use (19). There is insufficient reliable information available about the safety of dried pulsatilla during breast-feeding.

(Read more about PULSATILLA)

LIKELY SAFE ...when used orally in amounts commonly found in foods. Thuja that is thujone-free has Generally Recognized As Safe (GRAS) status for use in foods in the US (4912).

POSSIBLY UNSAFE ...when used orally in medicinal amounts. Large doses of thuja have been reported to cause seizures, severe vomiting, organ toxicity, and death in some cases (6002,40888). There is insufficient reliable information available about the safety of thuja when used topically.

PREGNANCY: LIKELY UNSAFE
when used orally due to abortifacient activity (12); avoid using.

LACTATION: LIKELY UNSAFE
when used orally due to toxicity (11); avoid using.

(Read more about THUJA)

ANTICOAGULANT/ANTIPLATELET DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Unlikely •  Level of Evidence = D Theoretically, arnica might have additive effects with anticoagulant and antiplatelet drugs. Homeopathic arnica preparations are unlikely to have this interaction.  Details In vitro evidence shows that sesquiterpene lactones in arnica flowers can decrease platelet aggregation (104). However, this effect has not been reported in humans.

(Read more about ARNICA)

ANTICHOLINERGIC DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Probable •  Level of Evidence = D Belladonna may increase the risk of adverse effects when used concomitantly with anticholinergic drugs.  Details Belladonna has anticholinergic activity and increases the activity of anticholinergic drugs (2,12).

CISAPRIDE (Propulsid) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, belladonna might reduce the effects of cisapride.  Details Belladonna contains atropine. In vivo evidence suggests that atropine can prevent cisapride from increasing motility in the gastrointestinal tract (25191).

(Read more about BELLADONNA)

(Read more about BITTERSWEET NIGHTSHADE)

(Read more about BRYONIA)

CAFFEINE Interaction Rating = Moderate Be cautious with this combination. Severity = Mild •  Occurrence = Probable •  Level of Evidence = B Echinacea can increase plasma levels of caffeine by inhibiting its metabolism.  Details Echinacea seems to increase plasma concentrations of caffeine by around 30% (12155). This is likely due to inhibition of cytochrome P450 1A2 (CYP1A2) by echinacea.

CYTOCHROME P450 1A2 (CYP1A2) SUBSTRATES Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = B Echinacea might inhibit the metabolism of CYP1A2 and increase plasma levels of some drugs.  Details Echinacea appears to inhibit CYP1A2 enzymes in humans. Additionally, echinacea seems to increase plasma concentrations of caffeine, a CYP1A2 substrate, by around 30% (12155). Theoretically, echinacea might increase levels of other drugs metabolized by CYP1A2.

CYTOCHROME P450 3A4 (CYP3A4) SUBSTRATES Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = B Echinacea may induce hepatic CYP3A4 and inhibit intestinal CYP3A4. This may increase or decrease levels of drugs metabolized by CYP3A4.  Details Several clinical trials have shown that taking echinacea for up to one month does not significantly affect the metabolism of various CYP3A4 substrates, including midazolam, docetaxel, etravirine, lopinavir-ritonavir, and darunavir-ritonavir (13712,48618,88164,88165). However, other clinical research shows that echinacea may increase the clearance of midazolam, suggesting that echinacea might induce CYP3A4 (48618). The discrepancy is thought to be due to differing effects of echinacea on intestinal versus hepatic CYP3A4 enzymes. Echinacea appears to induce hepatic CYP3A4 but inhibit intestinal CYP3A4 (12155). In some cases, these effects might cancel each other out, but in others, drug levels may be increased or decreased depending on the level of effect at hepatic and intestinal sites. The effect of echinacea on CYP3A4 activity may differ depending on the CYP3A4 substrate (6450,11026,88162,88167).

DARUNAVIR (Prezista) Interaction Rating = Minor Be watchful with this combination. Severity = Insignificant •  Occurrence = Unlikely •  Level of Evidence = B Theoretically, echinacea may interfere with the metabolism of darunavir; however, a small clinical study found no effect.  Details Darunavir is metabolized by cytochrome P450 3A4 (CYP3A4) and is administered with the CYP3A4 inhibitor ritonavir to increase its plasma concentrations. Echinacea has variable effects on CYP3A4, but administration of an E. purpurea root extract (Arkocapsulas Echinacea, Arkopharma) 500 mg four times daily for 14 days did not affect darunavir/ritonavir pharmacokinetics in 15 HIV-infected patients (88163,93578).

DOCETAXEL (Taxotere) Interaction Rating = Minor Be watchful with this combination. Severity = Insignificant •  Occurrence = Unlikely •  Level of Evidence = B Theoretically, echinacea may interfere with the metabolism of docetaxel; however, a small clinical study found no effect.  Details Docetaxel is metabolized by cytochrome P450 3A4 (CYP3A4). Echinacea has variable effects on CYP3A4, but taking E. purpurea whole plant extract (Echinaforce, A. Vogel Biopharma AG) 20 drops three times daily for 2 weeks did not alter the pharmacokinetics of docetaxel in one clinical study (88164).

ETOPOSIDE (VePesid) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Echinacea may increase levels of etoposide.  Details In one report, concomitant use of etoposide and echinacea was associated with more severe thrombocytopenia than the use of etoposide alone, suggesting inhibition of etoposide metabolism (20082). Etoposide is a cytochrome P450 3A4 (CYP3A4) substrate. Echinacea has variable effects on CYP3A4, but some studies have reported inhibition of the enzyme (6450,11026,12155,88162,88167).

ETRAVIRINE (Intelence) Interaction Rating = Minor Be watchful with this combination. Severity = Insignificant •  Occurrence = Unlikely •  Level of Evidence = B Theoretically, echinacea may interfere with the metabolism of etravirine; however, a small clinical study found no effect.  Details Etravirine is metabolized by cytochrome P450 3A4 (CYP3A4). Echinacea has variable effects on CYP3A4, but taking E. purpurea root extract (Arkocapsulas Echinacea, Arkopharma) 500 mg three times daily for 14 days did not alter the pharmacokinetics of etravirine in HIV-infected patients (88165,93578).

IMMUNOSUPPRESSANTS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = B Echinacea has immunostimulant activity which may interfere with immunosuppressant therapy.  Details Theoretically, echinacea may interfere with immunosuppressant therapy because of its immunostimulant activity (3279,6388,6389,12639).

LOPINAVIR/RITONAVIR (Kaletra) Interaction Rating = Minor Be watchful with this combination. Severity = Insignificant •  Occurrence = Unlikely •  Level of Evidence = B Theoretically, echinacea may interfere with the metabolism of lopinavir; however, a small clinical study found no effect.  Details Lopinavir is metabolized by cytochrome P450 3A4 (CYP3A4) and is administered with the CYP3A4 inhibitor ritonavir to increase its plasma concentrations. Echinacea has variable effects on CYP3A4, but taking E. purpurea (Echinamide, Natural Factors Nutritional Products, Inc.) 500 mg three times daily for 14 days did not alter the pharmacokinetics of lopinavir/ritonavir in healthy volunteers (48618,93578).

MIDAZOLAM (Versed) Interaction Rating = Minor Be watchful with this combination. Severity = Insignificant •  Occurrence = Possible •  Level of Evidence = B Theoretically, echinacea may increase the metabolism of intravenous midazolam.  Details Echinacea induces hepatic CYP3A4 and might decrease plasma levels of midazolam by about 20%, reducing the effectiveness of intravenous midazolam (12155). Echinacea also appears to inhibit intestinal CYP3A4, which could theoretically increase the bioavailability of oral midazolam. This may cancel out the decrease in availability caused by induction of hepatic CYP3A4, such that overall plasma levels after oral administration of midazolam are not affected by echinacea.

WARFARIN (Coumadin) Interaction Rating = Minor Be watchful with this combination. Severity = Insignificant •  Occurrence = Possible •  Level of Evidence = B Echinacea seems to increase the clearance of warfarin, although the effect may not be clinically significant.  Details Preliminary clinical research in healthy male volunteers suggests that taking echinacea increases the clearance of the active S-isomer of warfarin after a single dose of warfarin, but there was not a clinically significant effect on the INR (20083).

(Read more about ECHINACEA)

(Read more about POISON IVY)

(Read more about POKEWEED)

(Read more about PULSATILLA)

(Read more about THUJA)

General ...Orally, arnica is unsafe and can cause toxicity. When used in homeopathic amounts, arnica seem to be generally well tolerated. Topically, arnica also seems to be generally well tolerated.
Most Common Adverse Effects:
Orally: Bleeding, gastroenteritis, hypertension, muscle paralysis, nausea and vomiting, shortness of breath.
Topically: Contact dermatitis and irritation.
Serious Adverse Effects (Rare):
Orally: Arrhythmia, coma, multi-organ failure, and death.

Cardiovascular ...Orally, arnica can cause tachycardia or a faster heart rate (11,17113,19101,19102). A 24-year-old female presented to the emergency department with palpitations and vomiting 24 hours after ingesting a cup of tea that reportedly contained arnica flowers picked from her local area of mountainous Southern California. The species was not specified in the article and there was no indication by the authors that any testing had been done to confirm the identity of the plant (90610).

Dermatologic ...Orally, arnica can cause irritation of mucous membranes (11,17113). Topically, arnica can cause contact itchiness, dry skin, and rash (17113). Oral lesions resulted in a woman who used a mouthwash incorrectly by not following dilution instructions. The mouthwash was 70% alcohol and contained arnica and oil of peppermint (19106).

Gastrointestinal ...Orally, arnica can cause stomach pain, nausea, vomiting, and diarrhea (11,17113,19101,19102). Homeopathic arnica has been reported to cause dry mouth (30C) and sore tongue (6C) (19107). A 24-year-old female presented to the emergency department with palpitations and vomiting 24 hours after ingesting a cup of tea that reportedly contained arnica flowers picked from her local area of mountainous Southern California. The species was not specified in the article and there was no indication by the authors that any testing had been done to confirm the identity of the plant (90610).

Musculoskeletal ...Adverse effects after ingesting arnica include muscle weakness (19101). Homeopathic arnica has been reported to result in the feeling of a "throbby" head or neck (19107).

Neurologic/CNS ...Orally, arnica may cause drowsiness, nervousness, and headache (11,17113,19101,19107).

Ocular/Otic ...In a case report, accidental intake of a large amount of a homeopathic Arnica-30 resulted in acute vision loss due to bilateral toxic optic neuropathy (19105).

Psychiatric ...Oral homeopathic arnica (6C) may cause depressed feelings, specifically a feeling of unhappiness (19107).

Pulmonary/Respiratory ...Orally, arnica can cause shortness of breath (11,17113).

(Read more about ARNICA)

General ...Orally, belladonna can cause anticholinergic side effects even at low doses, and is considered poisonous.
Most Common Adverse Effects:
Orally: Anticholinergic side effects, including blurred vision, constipation, delirium, dilated pupils, dizziness, dry mouth, fever, headache, hypertension, muscle rigidity and tremor, psychosis, respiratory failure, and slurred speech.

Cardiovascular ...Orally, belladonna can cause anticholinergic side effects such as hypertension, hypotension, tachycardia, and ventricular premature beats (553,34168,34180).

Dermatologic ...Orally, belladonna can cause anticholinergic side effects such as dry, red skin and decreased perspiration (553,34146,34152). One case of rash and another case of hives have been reported in patients taking belladonna with phenobarbital and ergotamine orally; it is unclear if the adverse effects were due to belladonna or the other ingredients (34154).
Topically, belladonna plaster (Cuxon Gerrard) can cause contact dermatitis (34152).

Gastrointestinal ...Orally, belladonna can cause anticholinergic side effects such as dry mouth and constipation (553,34162,34163,34176,34180,34181).

Genitourinary ...Orally, belladonna can cause anticholinergic side effects such as urinary retention (553,34145,34150,34163).

Neurologic/CNS ...Orally, belladonna can cause anticholinergic side effects such as memory and attention impairment, headache, and confusion (553,34163,34180).

Ocular/Otic ...Orally and topically, belladonna can cause anticholinergic side effects such as dilation of pupils and blurred vision (553,34157,34168,34169,34180). A case report describes anisocoria (unequal pupil sizes) in a 70-year-old female who used homeopathic pink eye relief drops (Similasan) containing belladonna, eyebright, and hepar sulphuris (calcium sulfide) in one eye for 3 days. The pupil dilation lasted more than 2 weeks and did not respond to bright light or pilocarpine (106907). Another report describes a case of acute angle closure glaucoma, requiring referral to an ophthalmologist, in a 55-year-old female who used these eye drops for 2 days (106906).

(Read more about BELLADONNA)

General ...When used orally, the leaves and berries of bittersweet nightshade may be unsafe. There is limited information available about the adverse effects of the stem of bittersweet nightshade when used in medicinal amounts.
Serious Adverse Effects (Rare):
Orally: The leaves and berries can cause toxicity, including circulatory and respiratory depression, convulsions, cyanosis, diarrhea, dilated pupils, gastrointestinal bleeding, headache, scratchy throat, speech difficulties, subnormal temperature, vertigo, vomiting, and even death.

Cardiovascular ...Orally, bittersweet nightshade leaf and berry can cause circulatory depression (6).

Gastrointestinal ...Orally, bittersweet nightshade leaf and berry can cause diarrhea, gastrointestinal bleeding, scratchy throat, vomiting and (6).

Neurologic/CNS ...Orally, bittersweet nightshade leaf and berry can cause convulsions, headache, speech difficulties, subnormal temperature, and vertigo (6).

Ocular/Otic ...Orally, bittersweet nightshade leaf and berry can cause dilated pupils (6).

Pulmonary/Respiratory ...Orally, bittersweet nightshade leaf and berry can cause cyanosis and respiratory depression (6).

(Read more about BITTERSWEET NIGHTSHADE)

General ...Orally, bryonia root can cause dizziness, vomiting, convulsions, colic, bloody diarrhea, abortion, nervous excitement, and kidney damage. Large doses of bryonia can cause anuria, collapse, paralysis, and death (2). Bryonia berries can be fatal when taken orally; 40 berries can be fatal in adults, and 15 berries can be fatal in children (18).
Topically, skin contact with fresh bryonia may cause irritation (19).

Dermatologic ...Topically, skin contact with fresh bryonia may cause irritation (19).

Gastrointestinal ...Orally, bryonia root can cause vomiting, colic, and bloody diarrhea (2).

Genitourinary ...Orally, bryonia root can cause abortion (2). Large doses of bryonia can cause anuria and death (2).

Musculoskeletal ...Orally, large doses of bryonia can cause paralysis and death (2).

Neurologic/CNS ...Orally, bryonia root can cause dizziness, convulsions, and nervous excitement (2). Large doses of bryonia can cause paralysis and death (2).

Renal ...Orally, bryonia root can cause kidney damage (2). Large doses of bryonia can cause anuria and death (2).

Other ...Orally, bryonia berries can be fatal. Consuming 40 berries can be fatal in adults and as few as 15 berries can be fatal in children (18).

(Read more about BRYONIA)

General ...Orally, echinacea is well tolerated.
Most Common Adverse Effects:
Orally: Abdominal pain, constipation, diarrhea, heartburn, nausea and vomiting, rashes, and stomach upset.
Serious Adverse Effects (Rare):
Orally: Severe allergic reactions and hepatitis have been reported.

Dermatologic ...Itching, urticaria, tingling, and allergic rashes have been reported with various echinacea preparations (8225,12355,17519,20059,20077,101592,111530,111540). In a study of children aged 2-11 years, rash occurred in about 7% of children treated with an extract of the above-ground parts of E. purpurea (EC31J2, Echinacin Saft, Madaus AG), compared with about 3% of those treated with placebo (4989,95652). There is concern that allergic reactions could be severe in some children. The Medicines and Healthcare Products Regulatory Agency in the United Kingdom (UK) recommends against the use of oral echinacea products in children under 12 years of age due to this risk of allergic reaction (18207). However, another study in children 4-12 years old shows that a specific E. purpurea product (Echinaforce Junior, A. Vogel) did not cause allergic or urticarial reactions more frequently than vitamin C (105719).

Gastrointestinal ...Gastrointestinal adverse effects include nausea and vomiting, abdominal pain, stomach upset, heartburn, diarrhea, and constipation (10802,11970,12355,13419,17519,20059,48680,105719,106626). An unpleasant taste, dry mouth, and burning, tingling or numbness of the tongue also occur (11970,12355,17519,20059,20070,20077).

Hematologic ...A 51-year-old female presented with leukopenia after taking echinacea 450 mg three times daily for 2 months, along with ginkgo biloba, multivitamins, and calcium. Her leukocyte count recovered upon stopping these supplements, but dropped again when she restarted echinacea alone about a year later. The problem resolved when echinacea was stopped permanently (48533). A 32-year-old male presented with severe thrombotic thrombocytopenic purpura (TTP) about 2 weeks after using an extract of E. pallida to treat a cold. He required admission to an intensive care unit and extensive plasmapheresis. The authors speculate that immunostimulant effects of echinacea induced or exacerbated the TTP (48572).

Hepatic ...Although uncommon, cases of echinacea-induced hepatitis have been reported. One case report describes acute cholestatic autoimmune hepatitis in a 45-year-old male who had been taking an echinacea root extract 1500 mg daily for about 2 weeks. He presented with significantly elevated liver function tests (LFTs), elevated immunoglobulin G (IgG) levels, and a positive test for anti-smooth muscle antibodies, indicating an autoimmune process. Elevated LFTs and IgG levels returned to normal within one month of stopping echinacea (17518). Another case report describes acute cholestatic hepatitis in a 44-year-old male who had taken echinacea root tablets 600 mg daily for 5 days to treat flu-like symptoms. He presented with elevated LFTs, prothrombin time, and international normalized ratio (INR). His condition gradually improved after stopping echinacea, and his LFTs normalized within 3 months (91528).
Seven cases of hepatitis associated with echinacea use were reported to the Australian Adverse Drug Reactions Advisory Committee between 1979 and 2000, but specific details are lacking (8225).
One case report describes acute liver failure in a 2 year-old child who had been given about 100 mg of echinacea daily for 2 weeks. The patient presented with jaundice, diarrhea, lethargy, anorexia, and significantly elevated LFTs. A liver biopsy showed hepatocyte swelling, spotty necrosis, and inflammatory infiltrate with eosinophils. A full recovery was made over a 2-week period (88166).

Immunologic ...Allergic reactions, including urticaria, runny nose, dyspnea, bronchospasm, acute asthma, angioedema, and anaphylaxis, have been reported with various echinacea preparations (638,1358,8225). Atopic individuals and those sensitive to other members of the Asteraceae family (ragweed, chrysanthemums, marigolds, daisies) seem to be at higher risk for these reactions (1358,8225).
A case report describes a 36-year-old female who presented with muscle weakness, electrolyte abnormalities, renal tubular acidosis, fatigue, and dry mouth and eyes after taking echinacea, kava, and St. John's Wort for 2 weeks., She also had a positive antinuclear antibody (ANA) test, with elevated anti-dsDNA antibodies SSA and SSB. Sjogren syndrome was diagnosed; the authors hypothesize that it may have been triggered by the immunostimulant effects of echinacea (10319). A 55-year-old male with a history of pemphigus vulgaris in remission for about a year experienced a flare of the disease after taking an echinacea supplement for one week. After stopping echinacea, medical treatment resulted in partial control of the disease (12171). Another case report describes a 58-year-old male who presented with marked eosinophilia and elevated immunoglobulin E (IgE) levels while taking an echinacea supplement. He required prednisone therapy until he stopped taking echinacea 3 years later, at which time his eosinophils and IgE normalized (48623). A 41-year-old male experienced four episodes of erythema nodosum, each occurring after he had taken echinacea for early symptoms of influenza. After stopping echinacea, he had no further exacerbations of erythema nodosum, suggesting that it had been triggered by the immunostimulant effects of echinacea (7057).

Musculoskeletal ...Reports of arthralgia and myalgia have been associated with echinacea (13418).

Neurologic/CNS ...Headache has been reported in people taking various echinacea preparations orally (3282,11970,17519,20059,20064). Dizziness has also been reported (3282,8225,11970). In one study using an alcoholic extract of the above-ground parts of E. purpurea (EC31J0, Echinacin, Madaus AG), somnolence and a tendency to aggressiveness were reported (3282).

(Read more about ECHINACEA)

General ...When used orally or topically, poison ivy may be unsafe.
Most Common Adverse Effects:
Orally: Diarrhea, dizziness, fever, intestinal colic, nausea, vomiting, severe mucous membrane irritation.
Topically: Contact dermatitis, herpes-like blisters, reddening, swelling.
Inhaled: Fever.
Serious Adverse Effects (Rare):
Orally: Fever, hematuria, nephritis, stupor, unconsciousness.
Topically: Erythema multiforme, black spot poison ivy dermatitis. Eye contact can cause severe conjunctivitis, corneal inflammations, or loss of sight.
Inhaled: Lung infection, respiratory distress syndrome, throat swelling.

Dermatologic ...Topically, poison ivy can cause contact dermatitis, reddening, swelling, and herpes-like blisters (18). These reactions occur at the area of contact, usually within a few hours, but are sometimes delayed for several days (68970). Sometimes papules and vesicles develop and can spread beyond the area of initial contact, but are generally self-limiting and eventually form crusts. (3839,68955,68960,68977,69007,69008,69038,69042). In a few cases, small white papules known as milia have developed on an area of poison ivy exposure after the typical skin reaction has subsided (94222). Occasionally, poison ivy causes more severe dermatologic reactions such as erythema multiforme (3839,68983,69032,112851). Black spot poison ivy dermatitis also occurs in rare cases, with black lacquer-like lesions on the skin that cannot be washed off, followed by the typical pruritic papules (112850). The black lesions are concentrated urushiol oleoresin that has darkened with exposure to oxygen and moisture (68960,68997,69027,69034). They eventually peel off and the skin heals normally (68960,112850).

Gastrointestinal ...Orally, poison ivy can cause severe mucous membrane irritation, nausea, vomiting, and diarrhea (18).

Genitourinary ...Orally, poison ivy can cause hematuria (18).

Immunologic ...Cross-allergenicity with poison ivy exists with cashew, mango, and ginkgo biloba (106574).

Neurologic/CNS ...Orally, poison ivy can cause dizziness, fever, stupor, and unconsciousness (18).

Ocular/Otic ...Topically, eye contact with urushiol from poison ivy can cause severe conjunctivitis, corneal inflammation, and potentially loss of sight (18).

Pulmonary/Respiratory ...Inhaled, urushiol in the smoke from burning of poison ivy can result in life-threatening throat swelling, fever, and secondary lung infections (6). Respiratory distress syndrome after smoke inhalation from burning poison ivy has also been reported (69036). Two fatal cases of acute respiratory distress and anaphylaxis after inhaling burned poison ivy are reported in patients with known allergies to poison ivy (112420).

Renal ...Orally, poison ivy can cause nephritis (18).

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General ...Pokeweed is generally regarded as unsafe for use. Any benefits of therapy may not outweigh the risk of toxicity. Orally, all parts of the pokeweed plant can cause nausea, vomiting, cramping, abdominal pain, diarrhea, a burning sensation in the mouth and throat, weakness, hypotension, bloody emesis, bloody diarrhea, tachycardia, difficulty breathing, salivation, urinary incontinence, spasms, convulsions (3477,3478,3479), severe thirst, somnolence, transient blindness, respiratory failure (3477,3479), and death (3477).
Orally and topically, pokeweed has been reported to cause plasmacytosis, mitotic changes in peripheral blood cells, eosinophilia, thrombocytopenia, abnormal platelet morphology, and other hematologic abnormalities (3477,3478,3481,3482). Protective gloves should be used to handle the plant (3477).

Cardiovascular ...Orally, all parts of the pokeweed plant can cause hypotension and tachycardia (3477,3478,3479).

Gastrointestinal ...Orally, all parts of the pokeweed plant can cause nausea, vomiting, cramping, abdominal pain, diarrhea, a burning sensation in the mouth and throat, bloody emesis, and bloody diarrhea (3477,3478,3479).

Genitourinary ...Orally, all parts of the pokeweed plant can cause urinary incontinence (3477,3478,3479).

Hematologic ...Orally and topically, pokeweed has been reported to cause plasmacytosis, mitotic changes in peripheral blood cells, eosinophilia, thrombocytopenia, abnormal platelet morphology, and other hematologic abnormalities. When used topically, these effects are more likely to occur in individuals with cuts or abrasions on the skin (3477,3478,3481,3482). Protective gloves should be used to handle the plant (3477).

Neurologic/CNS ...Orally, all parts of the pokeweed plant can cause weakness, salivation, spasms, convulsions (3477,3478,3479), severe thirst, and somnolence (3477,3479).

Ocular/Otic ...Orally, all parts of the pokeweed plant can cause transient blindness (3477,3479),

Pulmonary/Respiratory ...Orally, all parts of the pokeweed plant can cause difficulty breathing (3477,3478,3479), respiratory failure (3477,3479), and death (3477).

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General ...Orally, fresh pulsatilla is a toxic gastrointestinal irritant (4,19). It can also cause kidney and urinary tract irritation (2).
Topically, contact with the fresh plant can cause skin irritation, mucous membrane irritation, itching, and pustule formation known as ranunculus dermatitis (2). Allergic reactions to pulsatilla volatile oil have been documented with patch tests (4).
Inhalation of pulsatilla volatile oil may cause nasal mucosal and conjunctival irritation (4).

Dermatologic ...Topically, contact with the fresh plant can cause skin irritation, mucous membrane irritation, itching, and pustule formation known as ranunculus dermatitis (2).

Gastrointestinal ...Orally, fresh pulsatilla is a toxic gastrointestinal irritant (4,19).

Genitourinary ...Orally, fresh pulsatilla can cause urinary tract irritation (2).

Immunologic ...Topically, allergic reactions to the protoanemonin-containing volatile oil of pulsatilla have been documented with patch tests (4).

Ocular/Otic ...Inhalation of the protoanemonin-containing volatile oil of pulsatilla may cause conjunctival irritation (4).

Pulmonary/Respiratory ...Inhalation of the protoanemonin-containing volatile oil of pulsatilla may cause nasal mucosal irritation (4).

Renal ...Orally, fresh pulsatilla can cause kidney irritation (2).

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General ...Orally, large doses of thuja have been reported to cause toxicity involving headache, nervous agitation, seizures, gastric irritation, vomiting, abdominal pain, and diarrhea. Thuja toxicity has also been reported to cause liver damage, renal toxicity, and death in some cases (6002,40888).

Dermatologic ...Contact dermatitis, presenting as an itchy papular squamous eruption on the hands, developed in a 46-year-old female who handled thuja plants while gardening. It resolved when contact with thuja was avoided. The causative ingredient of thuja was identified as limonene (113415).
In one case report, a 5-year-old female presented with a papillary eccrine adenoma. In an effort to avoid excisional biopsy, an ointment containing thuja was applied to the lesion for 6 months, resulting in peripheral extension and central necrosis of the lesion, eventually necessitating complete excision (106048).

Gastrointestinal ...Orally, large doses of thuja have been reported to cause toxicity involving gastric irritation, vomiting, abdominal pain, and diarrhea (6002,40888).

Hepatic ...Orally, large doses of thuja have been reported to cause toxicity involving liver damage and death (6002,40888). In one case report, a healthy 40-year-old female taking thuja and black cohosh for 1 month presented with 3 days of severe abdominal pain and AST and ALT levels exceeding 5 times the upper limit of normal. Symptoms improved within 5 days of supplement discontinuation and levels normalized within 2 weeks (106047). It is unclear if this reaction was due to thuja, black cohosh, or other factors.

Neurologic/CNS ...Orally, large doses of thuja have been reported to cause toxicity involving nervous agitation, seizures, and death (6002,40888).

Renal ...Orally, large doses of thuja have been reported to cause toxicity involving renal toxicity and death (6002,40888).

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