Shockingly, two “dietary supplements” for male enhancement have been found to contain active ingredients that happen to treat erectile dysfunction. Effectively, these products are unannounced and unregulated versions of Viagra (X-Hero) and Cialis (Male Enhancer), both of which have risks of negative interactions with other drugs. These interactions can only be avoided if individuals are aware that they are being exposed.
FDA lab analysis of X-Hero found the product contains sulfosildenafil, the analogue of the active ingredient of an FDA-approved drug used to treat erectile dysfunction (ED), making X-Hero an unapproved drug. In addition, FDA analysis of Male Enhancer sample found the product contains tadalafil, the active ingredient of an FDA-approved drug used to treat erectile dysfunction (ED), making Male Enhancer an unapproved drug.
The products pose a threat to consumers because they may interact with nitrates found in some prescription drugs (such as nitroglycerin) and may lower blood pressure to dangerous levels. Consumers with diabetes, high blood pressure, high cholesterol, or heart disease often take nitrates. ED is a common problem in men with these conditions, and they may seek products to enhance sexual performance.
–FDA Medwatch (emphasis added)