The herb Vitex agnus-castus, commonly called chasteberry, and the herb Angelica sinensis, commonly called dong quai, are theorized to have benefits for women. The two herbs are used in alternative health circles to relieve unpleasant symptoms of premenstrual syndrome, menstruation and menopause. Formulations are available containing both herbs. Consult a qualified health care provider before taking chasteberry or dong quai, as both can cause some negative effects.
Photosensitivity
Dong quai increases sensitivity to ultraviolet light in some people, warns the University of Maryland Medical Center. This sensitivity can lead to skin inflammation, sunburn and rashes if you spend time in sunlight, tanning booths or under a sunlamp while taking this herb. Doing so also may increase the risk of skin cancer. Wear protective clothing when going outside and use sunscreen if you consume dong quai.
Carcinogenic Risk
Dong quai contains carcinogenic chemicals, or chemicals that may cause cancer. For this reason, taking the herb in large dosages for prolonged time frames may not be safe, according to MedlinePlus.
Chasteberry Side Effects
Chasteberry is associated with numerous unrelated and generally minor side effects. Digestive side effects may include stomach discomfort, nausea and diarrhea. You could experience dizziness, headaches, fatigue, insomnia, acne and hair loss. Chasteberry also has been associated with irregular menstrual bleeding and increased menstrual flow.
Allergic Reaction
Chasteberry and dong quai may cause allergic reactions. Signs of an allergic reaction to these herbs could include itching, rash, hives, wheezing, trouble breathing, and throat, face or mouth swelling. You should consider an allergic reaction to chasteberry or dong quai to be a medical emergency.
Chasteberry Contraindications
Because chasteberry may affect hormone levels, you should not consume this herb if you are pregnant or if you take birth control pills, according to the National Center for Complementary and Alternative Medicine. Women with hormone-sensitive health problems, such as breast or ovarian cancer, also should not consume chasteberry. Chasteberry may affect the brain's dopamine system, so do not consume this herb if you take dopamine-related medications. These medicines are used to treat disorders such as Parkinson's disease and certain serious mental illnesses.
Dong Quai Contraindications
Dong quai also may present risks for pregnant women, reports the University of Maryland Medical Center. The herb may cause the uterus to contract, which increases the chance of miscarriage. As with chasteberry, women who have or are at increased risk of hormone-related cancers also should not take dong quai. In addition, dong quai may slow blood clotting, notes MedlinePlus. This slowed blood clotting can boost the blood-thinning properties of medications such as warfarin, heparin, ibuprofen and aspirin. The combination can increase the risk of bleeding. Stop taking dong quai at least two weeks before having surgery because the herb may elevate bleeding risk.
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