Viagra Connect helps to temporarily treat both the physical causes of ED and the psychological causes of ED. VIAGRA was evaluated primarily at doses of 25 mg, 50 mg and mg in 21 randomized, double-blind, placebo-controlled trials of up to 6 months in duration, using a variety of study designs fixed dose, titration, parallel, crossover. Your doctor may need to change the doses of your medications or monitor you carefully for side effects. Maximum observed plasma concentrations are reached within 30 to minutes median 60 minutes of oral dosing in the fasted state. Sildenafil may cause side effects. This does not mean that patients will have an erection for 4 hours continuously but the medication remains active in the body and so there is the potential, with sexual stimulation, to achieve and maintain an erection for sexual intercourse.Generic Viagra (sildenafil) is available as a , , , and milligram (mg) pill and in liquid form. It’s meant to be taken as needed — about an hour before sex — but shouldn’t be. Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Sildenafil (Liqrev, Revatio) is used to improve the ability to exercise in adults (Liqrev, Revatio) and children 1 year of age and older (Revatio) with pulmonary arterial hypertension (PAH; high blood pressure in the vessels carrying blood to the . Viagra Alternatives: Pills, Natural Remedies, and Over-the-Counter Options A person can expect to pay around $64 from Amazon for this product. According to a study, UK. All rights.