updated 12/28/2007 6:47:30 PM ET 2007-12-28T23:47:30

Some Chinese-made dietary supplements marketed to provide male sexual enhancement contain undeclared erectile dysfunction drugs putting users at risk, the U.S. Food and Drug Administration warned Friday.

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The agency advised consumers to stay away from Shangai Chaojimengnan supplements sold under the names Super Shangai, Strong Testis, Shangai Ultra, Shangai Ultra X, Lady Shangai and Shangai Regular. The Chinese-made supplements are packaged and distributed by Shangai Distributor Inc. of Puerto Rico.

Product testing indicated that some of the so-called supplements contain Viagra's active ingredient, sildenafil, or a compound with a chemical structure that mimics sildenafil.

The chemicals could interact with nitrates in drugs taken for disorders commonly associated with erectile dysfunction, including diabetes, high blood pressure, high cholesterol and heart disease. The result could dangerously lower a user's blood pressure, according to the FDA.

The agency also warned that the safety and purity of the illegal ingredients is unknown.

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