Sildenafil Viagra is used to treat erectile dysfunction impotence; inability to get or keep an erection in men. Those with pre-existing conditions should always consult a healthcare provider before taking new medications or supplements. The major circulating metabolite results from N-desmethylation of sildenafil, and is itself further metabolized. Flibanserin is not approved in Australia. Key facts It usually takes 30 to 60 minutes for sildenafil to work for erectile dysfunction.Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in test1.ru is also used to treat pulmonary arterial hypertension, a serious heart and lung test1.ru drug is more popular than comparable drugs. It is available in generic and brand versions. Generic sildenafil is covered by most Medicare and insurance plans, but . What is Sildenafil (Viagra)? Drug Facts Common Brands Viagra Drug Class PDE-5 inhibitor Controlled Substance Classification Not a controlled medication Generic Status Lower . 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.