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Interaction Reported Between Warfarin, Chinese Wolfberry Tea

KEY POINT

Four days’ consumption of a Chinese herbal tea apparently disrupted metabolism of warfarin in a 61-year-old woman, leading to a rise in her international normalized ratio (INR) values from 2.5 to 4.1. Implicated in the case was Lycium barbarum L., an herbal product in the Solanaceae family that is also known as Chinese wolfberry, gou qi zi, Fructus Lycii Chinensis, and Lycium chinense.

SOURCES

Lam AY et al. Possible interaction between warfarin and Lycium barbarum L. Ann Pharmacother. 2001;35:1199–201.