The pattern of responses was similar for the other principal question, the ability to achieve an erection sufficient for intercourse. Brand names Why is this medication prescribed? The mean steady state volume of distribution Vss for sildenafil is L, indicating distribution into the tissues. However, if you take sildenafil with a high-fat meal, it will take longer for the medication to start to work. However, the dosage can range from 25— mg.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 . 50 mg sildenafil oral tablet from $ for 15 tablets mg sildenafil oral tablet from $ for 2 tablets Sildenafil Coupons, Copay Cards and Rebates Sildenafil offers may . Sildenafil citrate is a white to off-white crystalline powder with a solubility of mg/mL in water and a molecular weight of VIAGRA is formulated as blue, film-coated rounded-diamond-shaped tablets equivalent to 25 mg, 50 mg and mg of sildenafil for oral administration.