Sexual enhancement supplements could pose danger as they contain hidden drugs, warns the US Food and Drug Administration. According to the FDA, a supplement called "Stiff Days" contains sildenafil, the active ingredient in prescription drug Viagra, which is used to treat erectile dysfunction; "Rock-It Man" contains a similar compound called hydroxythiohomosildenafil; and "Libido Sexual Enhancer" contains both of those ingredients as well as tadalafil, which is the active ingredient in the prescription drug Cialis, Fox News reported.
"These undeclared ingredients may interact with nitrates found in some prescription drugs, such as nitroglycerin, and may lower blood pressure to dangerous levels. Men with diabetes, high blood pressure, high cholesterol, or heart disease often take nitrates," the agency said on its website.
The products are sold online and in some retail stores.
Consumers should be careful about purchasing such products, the FDA said, because the agency is unable to test and identify all products on the market that are marketed as dietary supplements but have potentially harmful hidden ingredients.