Chasteberry, also known as vitex or monk's pepper, contains medicinal compounds believed to influence the female endocrine system. The American Academy of Family Physicians reports that studies of chasteberry offer promising but inconsistent support for its use in medicine. In general, chasteberry is safe and associated with few side effects or risks.
General Safety
The American Academy of Family Physicians calls chasteberry "safe" and "well-tolerated." Although several theoretical concerns exist regarding the herb's use in conjunction with certain prescription drugs, it has no proven contraindications or drug interactions. Nevertheless, women interested in using chasteberry should first consult their physicians to discuss the theoretical benefits and risks.
Gastrointestinal Complaints
Mild digestive upset is among the most common symptoms associated with chasteberry supplements, according to the National Center for Complementary and Alternative Medicine. Possible gastrointestinal side effects include stomach cramping, gas, mild diarrhea, heartburn and nausea. The American Academy of Family Physicians describes these as "mild." The effects are unlikely to be severe enough to warrant discontinuation of the product.
Risk of Rash
The NCCAM reports that chasteberry supplements can cause acne-like rashes in some susceptible individuals. These skin irritations can have a bumpy texture and may signal a mild allergic reaction. Consult your health care provider if the rash is severe or persistent.
Dizziness and Fatigue
The AAFP links chasteberry to mild cases of fatigue, tiredness, dizziness and headache. As a precaution, patients may wish to avoid driving until they know exactly how chasteberry might affect alertness and mental clarity.
Drug Interactions
No medical literature has documented any interactions between chasteberry and prescription drugs. However, several theoretical concerns exist. The AAFP reports that chasteberry may interact with bromocriptine and metoclopramide, two drugs used in the treatment of Parkinson's disease. The NCCAM warns that chasteberry may also interact with oral contraceptives, since it influences the hormones involved in reproduction. Women taking medication should not use chasteberry except under a physician's guidance.
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