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.
Mitka M. Study Reveals Ginseng Supplements May Hamper Effects of Anticlotting Drug. JAMA. 2004;292(6):674. doi:10.1001/jama.292.6.674