Sexual stigma can make it difficult to accept when we have fetishes, kinks, or preferences that live outside of heteronormativity — but when we embrace these things in ourselves, it often leads to better sex. A stronger CYP3A4 inhibitor such as ketoconazole or itraconazole could be expected to have greater effect than that seen with saquinavir. Be sure to let your doctor and pharmacist know that you are taking these medications before you start taking sildenafil. This site is intended only for U. Sexual activity may be a strain on your heart, especially if you have heart disease. Ask your doctor if you have any questions. Part 2.Viagra, or sildenafil, was the first oral pill approved by the FDA to treat erectile dysfunction. Pfizer released Viagra in and, since then, generic versions of the drug have become available, too. Viagra, along with other ED medications such as Cialis (tadalafil) and Levitra (vardenafil), functions as a phosphodiesterase 5 (PDE5) inhibitor. About sildenafil (Viagra) Sildenafil is a medicine used to treat erection problems (erectile dysfunction). Sildenafil is also sometimes used to treat pulmonary hypertension (high blood pressure in the blood vessels that supply the lungs). If you have erection problems sildenafil works by temporarily increasing blood flow to your penis when. The Savings Offer and Program expire on 12/31/ For further information, call , visit , or write: Viatris Inc., P.O. Box , Mission, KS Eligible patients may save on their VIAGRA® (sildenafil citrate) prescription with the VIAGRA savings card.