Available in some retail stores and online, sexual enhancement supplements can contain hidden drugs that may cause adverse reactions when combined with prescription drugs. Sildenafil, which is the active ingredient in Viagra, is found in a supplement called “Stiff Days.” A similar ingredient, hydroxythiohomosildenafil, is among the ingredients in “Rock-It Man.” Another supplement, called “Libido Sexual Enhancer” contains sildenafil, hydroxythiohomosildenafil, and tadalafil, the active ingredient in Cialis. All of these ingredients can interact with nitrates, which are found in drugs used to treat diabetes, high cholesterol, high blood pressure, and heart disease, and can lower blood pressure to dangerous levels.

Read the full article here: FDA Warns Sexual Enhancement Supplements Contain Hidden Drugs