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CLEVELAND, Ohio-- The Food and Drug Administration (FDA) is warning consumers that a sexual enhancement supplement called Weekend Warrior contains an undisclosed drug ingredient that is similar to the erectile dysfunction medication Viagra, making it potentially dangerous to people who take the supplement without knowing the drug's side effects.

The FDA's warning is part of a larger effort to bring attention to dietary supplements and conventional foods that contain hidden drug ingredients, which the agency says is a growing problem. Many of the products are sold as weight loss aids or for sexual enhancement and body-building.

Weekend Warrior, which is sold online by various web sites and in some retail stores, is advertised as "a new, highly effective male-enhancement pill that contains pharmaceutical grade ingredients." The supplement label lists eight natural ingredients, including tribulus and ginger root and several with dubious names such as cridimum and monnier extract. The label also includes a warning advising consumers against using the product within eight hours of any medications, or if you have high blood pressure or heart problems.

The label does not, however, list the active ingredient picked up by FDA lab analysis: thiosildenafil. This drug, which is structurally very similar to Viagra (also known as sildenafil), "may interact with nitrates found in some prescription drugs such as nitroglycerin and may lower blood pressure to dangerous levels," according to the FDA.

Men with chest pain (angina), high blood pressure and diabetes often take nitrates, which help open up the blood vessels, which reduces the workload of the heart.

Consumers should stop taking Weekend Warrior and dispose of it immediately. If you have experienced an adverse event, contact your doctor. Possible negative side effects, which would be similar to those when combining Viagra with nitrate medications, may include dizziness, fainting and even heart attack or stroke.

For a full list of FDA's warning notices, visit its public notification page.

If you've taken a dietary or weight loss supplement and experienced a side effect or adverse event, contact your doctor and report it to the FDA's MedWatch Safety Information and Adverse Event Reporting Program by completing a form online or by calling 1-800-332-1088 to request a form.
Source: http://www.cleveland.com/healthfit/index.ssf/2014/03/fda_warns_week...