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Medical News & Perspectives
August 11, 2004

Study Reveals Ginseng Supplements May Hamper Effects of Anticlotting Drug

JAMA. 2004;292(6):674. doi:10.1001/jama.292.6.674

Ginseng, a popular herbal supplement that proponents tout as a tonic for improved energy and vitality, reduces the effects of the anticlotting medication warfarin, according to a study by University of Chicago researchers.

The discovery was surprising, said the researchers, because ginseng taken alone also can promote bleeding and delay clot formation. These new findings mean that when physicians prescribe warfarin, they need to ask the patient about their ginseng use, said study author Chun-Su Yuan, MD, PhD, a professor of anesthesia and critical care at the University of Chicago.