Some illegal “street” drugs called “poppers” such as amyl nitrate, butyl nitrate, or nitrite. Do not keep outdated medicine or medicine no longer needed. Which Is More Effective? Do not take more or less of it or take it more often than prescribed by your doctor. What special precautions should I follow? Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Store mixed oral liquid in the refrigerator.Generic name: sildenafil (oral) [ sil-DEN-a-fil ] Brand names: Revatio, Viagra Drug class: Impotence agents Medically reviewed by Sophia Entringer, PharmD. Last updated on Uses Warnings Before taking Dosage Side effects Interactions FAQ What is Viagra? Sildenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). In combination with sexual stimulation, sildenafil works by increasing blood flow to the penis to. The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide.

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