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The FDA is warning consumers that O.M.G., a "natural" sexual health supplement sold for men, contains undisclosed sildenafil, or generic Viagra. The pharmaceutical ingredient makes the supplement dangerous, particularly to anyone taking nitrates for heart conditions.

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CLEVELAND, Ohio-- The Food and Drug Administration is warning consumers that an herbal sexual health supplement called O.M.G. contains generic Viagra and may be dangerous.

O.M.G., a sexual health supplement sold online and in some retail stores, is marketed as "all natural" with "no side effects." FDA testing revealed the presence of sildenafil, the generic version of Viagra, a FDA-approved medication that treats erectile dysfunction.

The FDA warns that O.M.G. "may interact with nitrates found in some prescription drugs such as nitroglycerin and may lower blood pressure to dangerous levels." Men with chest pain (angina), high blood pressure and diabetes often take nitrates, which help open up the blood vessels and reduces the workload of the heart.

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Consumers should stop taking O.M.G. 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.