Dong quai has been used for centuries as a component of traditional Chinese medicine (TCM), primarily as a treatment for menopause, menstrual disorders and heart disease. As of 2010, evidence of dong quai's efficacy is extremely limited, according to the University of Maryland Medical Center. Early studies suggest that it is ineffective as a treatment for menopausal complaints, but may help to ease the symptoms of other conditions. Additionally, experts warn that dong quai may cause side effects ranging from uncomfortable to life threatening.
Bleeding Risk
According to the U.S. National Institutes of Health, dong quai may have a weak anticoagulant effect. People with bleeding disorders and those taking anticoagulants should use dong quai only under the guidance of a qualified medical expert, since it could cause a life-threatening hemorrhagic event.
Estrogen-Like Effects
The National Institutes of Health report that dong quai may contain estrogen-like compounds. In theory, these could cause menstrual changes, infertility and drug interactions.
Cancer
In theory, hormone-affecting compounds found in dong quai may influence the course of hormone-sensitive cancers like breast cancer and endometrial cancer. The National Institutes of Health also identify safrole, a volatile oil found in dong quai, as a potential carcinogen.
Photosensitivity
According to the University of Maryland Medical Center, dong quai causes photosensitivity. People taking dong quai may be more prone to sun burns, rashes, inflammation and skin cancer.
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