The Medical Letter on Drugs and Therapeutics
In Brief: Herbal Warning
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The FDA recently advised health care professionals and consumers not to use a number of dietary supplements found to contain the phosphodiesterase-5 inhibitor sildenafil (Viagra) or an analog of the drug ( Although the effects of sildenafil may be noticeable (in men), the presence of other, possibly more toxic adulterants in dietary supplements may be more difficult or impossible to detect.

Other drugs previously found in dietary supplements have included lovastatin (Mevacor, and others), estrogen, alprazolam (Xanax, and others), indomethacin (Indocin, and others) and warfarin (Coumadin, and others). Aristolochic acid in Chinese herbal weight loss products caused acute renal failure in about 100 women in Belgium; at least 70 of them required dialysis or transplantation, and at least 18 developed urothelial cancer ( ... more      

The Medical Letter is a subscriber-funded nonprofit organization that publishes critical appraisals of new prescription drugs and comparative reviews of drugs for common diseases.

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Title: In Brief: Herbal Warning
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