Crataegus by Nestmann

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Angina. It is unclear if oral hawthorn is beneficial in patients with angina. Details: Preliminary clinical research in patients with angina taking chronic beta-adrenergic receptor blockers or ACE inhibitor therapy shows that taking a hawthorn (Crataegus pinnatifada) extract 100 mg orally three times daily for four weeks improves angina and electrocardiogram (ECG) findings and reduces nitroglycerin intake when compared with placebo (19242). Other preliminary clinical research in patients with unstable angina shows that taking hawthorn 10 grams and hu zang 15 grams orally daily for 4 weeks does not reduce the frequency of angina pectoris attacks when compared with control. However, taking hawthorn and hu zang improved some subjective symptom scores and quality of life scores (109610).
• Anxiety. Oral hawthorn has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: A clinical study in adults with mild to moderate generalized anxiety shows that taking a specific product (Sympathyl, not available in the US) containing hawthorn, magnesium, and California poppy for 90 days modestly improves anxiety scores when compared with placebo (12583). Also, a clinical study in adults with adjustment disorder and anxious mood shows that hawthorn, in combination with black horehound, passion flower, valerian, kola nut, and guarana, modestly improves anxiety scores when compared with placebo (6250). It is unclear if these effects are due to hawthorn, other ingredients, or the combination. Another small clinical study in healthy adults shows that taking a combination of herbal extracts containing hawthorn, passionflower, ballota, and valerian root daily for 14 days reduces subjective anxiety and objective sympathetic and autonomic nervous system activation in response to a psychosocial stressor when compared with placebo (111222). It is unclear if these effects are due to hawthorn, other ingredients, or the combination.
• Arrhythmia. Although there has been interest in using oral hawthorn for arrhythmia, there is insufficient reliable information about the clinical effects of arrhythmia for this condition.
• Atherosclerosis. Although there has been interest in using oral hawthorn for atherosclerosis, there is insufficient reliable information about the clinical effects of arrhythmia for this condition.
• Cardiovascular disease (CVD). Although there has been interest in using oral hawthorn for CVD, there is insufficient reliable information about the clinical effects of arrhythmia for this condition.
• Cognitive function. Oral hawthorn has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: In a preliminary clinical trial, a single dose of 25 drops of a combination product of D-camphor and hawthorn berry extract (Korodin) was superior to placebo for increasing cognitive performance in elderly female patients as measured by visuomotor speed and information processing capacity. The active treatment group showed an improvement in attentional and mental performance (19240,91504).
• Congestive heart failure (CHF). The evidence on the effects of oral hawthorn in patients with CHF is conflicting. Although some older research suggests it may be beneficial, more recent, larger studies suggest it may actually increase the risk for complications. Details: There is contradictory evidence about the effects of hawthorn extract in heart failure patients. Several clinical studies show that taking specific hawthorn leaf and flower extracts (LI 132, Faros 300, Lichtwer Pharma; WS 1442, Crataegutt forte, Dr. Willmar Schwabe Pharmaceuticals; or HeartCare, Nature's Way) 240-600 mg daily improves ejection fraction and exercise tolerance, reduces subjective symptoms, and decreases the risk of death in patients with New York Heart Association (NYHA) stage II heart failure. In these studies, the maximum effect was usually seen after 6-12 weeks of treatment (8279,8280,11449,19221,19223,19225,19226,19227,19228). Another clinical trial shows that hawthorn extract (WS 1442, Crataegutt forte, Dr. Willmar Schwabe Pharmaceuticals or HeartCare, Nature's Way) 1800 mg daily, combined with diuretic therapy, improves exercise tolerance and reduces subjective symptoms in NYHA stage III heart failure. In this study, maximum effect was usually seen after 16 weeks of treatment (8281). In another trial, patients with NYHA II heart failure taking either hawthorn (LI 132, Faros) 300 mg three times daily or captopril 12.5 mg three times daily experienced similar improvements in cardiac performance and symptoms (19230). However, other clinical research suggests no benefit and possible harm with hawthorn. A large-scale clinical trial (SPICE) in patients with NYHA stage II or III heart failure shows that taking specific hawthorn extracts (WS 1442, Crataegutt forte, Dr. Willmar Schwabe Pharmaceuticals; HeartCare, Nature's Way) 900 mg daily for 24 months, in combination with conventional treatment, does not decrease hospitalization due to progressive heart failure, non-fatal myocardial infarction, or cardiac death (17203). Another clinical trial in patients with NYHA stage II or III heart failure shows that taking these same specific hawthorn extracts at the same dose for up to 6 months does not slow the progression of heart failure when compared with placebo (19222). In a retrospective analysis of this study, it was shown that heart failure progression was significantly increased in patients taking hawthorn when compared with placebo. The rate of death was also increased by 1.7% over placebo, and heart failure-related hospitalizations increased by 8% over placebo in patients treated with hawthorn (16824).
• Hyperlipidemia. Although there has been interest in using oral hawthorn for hyperlipidemia, there is insufficient reliable information about the clinical effects of arrhythmia for this condition.
• Hypertension. It is unclear if oral hawthorn is beneficial for lowering blood pressure. Details: One preliminary clinical trial showed that taking hawthorn standardized extract 1,000-2,500 mg daily for three days does not significantly reduce blood pressure in hypertensive or prehypertensive patients when compared with placebo (19244). However, another study in patients with diabetes and hypertension shows that taking a specific hawthorn extract (LI 132) 1,200mg daily for 16 weeks significantly decreased diastolic, but not systolic, blood pressure when compared with placebo (19245).
• Obesity. Although there has been interest in using oral hawthorn for obesity, there is insufficient reliable information about the clinical effects of hawthorn for this condition.
• Orthostatic hypotension. Oral hawthorn has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Preliminary clinical research in older adults with orthostatic hypotension shows that taking a specific combination product containing hawthorn and camphor (Korodin Herz-Kreislauf-Tropfen) 25 drops orally three times daily for 7 days attenuates the blood pressure reduction upon standing when compared with placebo. Signs and symptoms of orthostatic hypotension such as dizziness, blurry vision, and falls also seem to be reduced when compared with baseline (39614,39617). A meta-analysis of 4 studies shows that giving single doses of 20-25 drops of the same combination product increases systolic and diastolic blood pressure when compared with placebo (103620). However, the studies have methodologic problems and, while 2 were conducted in females with orthostatic hypotension, the others involved health young adults or normotensive elderly subjects. The effect of hawthorn alone for treatment of orthostatic hypotension has not been determined. The combination product used in these studies is not available in the US. More evidence is needed to rate hawthorn for these uses.

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POSSIBLY SAFE ...when used orally and appropriately, short-term. Hawthorn preparations in doses of up to 1800 mg daily seem to be safe when used for up to 16 weeks. Although hawthorn might be safe for long-term use, current studies have not evaluated safety past 16 weeks (8279,8280,8281,10144,17203,104689). There is insufficient reliable information available about the safety of hawthorn when used topically.

PREGNANCY AND LACTATION:
Insufficient reliable information available; avoid using.

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ANTICOAGULANT/ANTIPLATELET DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, hawthorn may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.  Details In vitro and animal research shows that hawthorn can inhibit platelet aggregation (95528,95529,95530,95531). However, its effect in humans is unclear. One observational study shows that patients taking hawthorn shortly before undergoing coronary artery bypass graft (CABG) surgery or valve replacement surgery have a 10% incidence of postoperative bleeding, compared with 1% in those who never consumed hawthorn extract (95527). However, clinical research shows that taking a specific preparation of dried hawthorn leaves and flowers (Crataesor, Soria Natural Lab) 800 mg three times daily for 15 days does not affect platelet aggregation or levels of thromboxane B2, the metabolite of thromboxane A2, in healthy humans (54664).

BETA-BLOCKERS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, concomitant use might cause additive effects on blood pressure and heart rate.  Details Some evidence shows that hawthorn might lower blood pressure and heart rate (12595,19245,113112,113113).

CALCIUM CHANNEL BLOCKERS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, concomitant use might cause additive coronary vasodilation and hypotensive effects.  Details Some evidence shows that hawthorn might lower blood pressure due to vasodilatory effects (12595,19245).

DIGOXIN (Lanoxin) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, hawthorn might potentiate the effects and adverse effects of digoxin.  Details Hawthorn appears to improve cardiac output (12595); however, hawthorn does not appear to affect digoxin pharmacokinetics (19249). Case reports suggest that at least one species of hawthorn root extract (Crataegus mexicana) may produce adverse effects similar to digoxin and can cross-react with digoxin assays, leading to falsely elevated plasma digoxin levels (113112,113113).

NITRATES Interaction Rating = Major Do not take this combination. Severity = High •  Occurrence = Probable •  Level of Evidence = D Theoretically, concomitant use might cause additive coronary vasodilatory effects.  Details Some evidence shows that hawthorn might lower blood pressure due to vasodilatory effects (12595,19245).

PHOSPHODIESTERASE-5 INHIBITORS Interaction Rating = Major Do not take this combination. Severity = High •  Occurrence = Probable •  Level of Evidence = D Theoretically, concomitant use might result in additive vasodilation and hypotension.  Details Hawthorn might inhibit PDE-5 and cause vasodilation (12595).

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General ...Orally, hawthorn seems to be well tolerated when used appropriately. Topically, no adverse effects have been reported, although a thorough evaluation of safety outcomes has not been conducted.
Serious Adverse Effects (Rare):
Orally: Multiorgan hypersensitivity reactions resulting in acute renal failure have been reported rarely.

Cardiovascular ...Orally, tachycardia (with facial pains) of uncertain relationship to hawthorn was reported in a multicenter clinical trial (54640). Palpitations (19244) were reported in three patients in a large surveillance trial of 3,664 patients with cardiac failure (54692) and in 11 patients with congestive heart failure (CHF) in a literature review of 5,577 patients (19247). Circulation failure has been reported in two patients with CHF in a literature review of 5,577 patients (19247). Incidences of hospitalization, hospitalization due to CHF, worsening of CHF, angina, and atrial fibrillation have also been reported with the use of hawthorn extract WS 1442 (Crataegutt forte), although it is unclear if these events are related to hawthorn supplementation or existing CHF (19222). In clinical trials, chest pain (8281), short-term increases in blood pressure (19240), and other non-specific heart problems (17203) have also been reported following the use of various hawthorn preparations (e.g. WS 1442, Korodin).
Orally, severe bradycardia, bradypnea, and Mobitz type 1 second degree heart block have been reported in a 16-year-old female who consumed Hawthorn root extract. Blood tests indicated plasma digoxin levels in the therapeutic range, despite no history of digoxin use. Medical treatment for digoxin cardiotoxicity did not improve symptoms. Symptoms gradually normalized over 3 days after discontinuation of the product (113112). Similarly, a 40-year-old female presented with bradycardia and elevated plasma digoxin levels after taking hawthorn root extract 196 mg daily for 2 days with no history of digoxin use. Symptoms resolved within 24 hours (113113).

Dermatologic ...Orally, erythematous rash has been reported in patients with CHF in a literature review of 5,577 patients (19247). Non-specific rashes and itching (19222,19243) as well as toxiderma from the fruits of hawthorn (54670) have also been reported.

Gastrointestinal ...Orally, rare abdominal discomfort of uncertain relationship to hawthorn has been reported in a large clinical trial, surveillance study, case reports, and a literature review (19247,54640,54692,113112). Digestive intolerance (19241), diarrhea (19243,113112), flatulence (8281), gastroenteritis (8281), increased bowel movements (19243), obstipation (8281), mild and rare nausea (10144,19247,19244), vomiting (113112), nutritional and metabolic problems (17203), and other non-specific gastrointestinal effects (19222), have also been reported. Furthermore, gastrointestinal hemorrhage has been reported in two patients with CHF in a literature review of 5,577 patients (19247).

Musculoskeletal ...In clinical trials, arthritis (8281), back pain (8281), weakness (19243), and other non-specific musculoskeletal effects (19222) have been reported following the use of various hawthorn preparations g. WS 1442, CKBM-A01). Additionally, in a case report, myalgia has been reported following use of hawthorn root extract (113113).

Neurologic/CNS ...Orally, headache and dizziness/vertigo were reported in 2 patients in a large surveillance trial of 3,664 patients with cardiac failure (54692), in 15 patients with CHF as reported in a literature review of 5,577 patients (19247), in a varying number of clinical trial participants (8281,19222,19244), and in case reports (113112,113113). Incidences of fainting (19222), fever (17203), and infrequent, mild and transient sleepiness have also been reported (19221,54692).

Psychiatric ...Orally, agitation was reported in a large surveillance trial of 3,664 patients with cardiac failure (54692).

Pulmonary/Respiratory ...Orally, bronchitis has been reported following the use of hawthorn extract WS 1442 (8281), and bradypnea has been reported following the use of hawthorn root extract (113112).

Renal ...A case of multiorgan hypersensitivity reaction and acute renal failure following the consumption of C. orientalis has been reported (54654).

Other ...Flu-like syndrome (8281) and other non-specific infections have been reported following the use of the hawthorn extract WS 1442 (17203,19222). Hawthorn has also been reported to cause nosebleeds (8281,10144).

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