What alternatives can I use for erectile dysfunction? As in the other titration studies, patients were started on 50 mg and allowed to adjust the dose up to mg or down to 25 mg of VIAGRA; all patients, however, were receiving 50 mg or mg at the end of the study. The changes from baseline in scoring on the two end point questions frequency of successful penetration during sexual activity and maintenance of erections after penetration were highly statistically significantly in favor of VIAGRA. The combination can cause a dangerous fall in your blood pressure. You can buy it from a store-based pharmacy or reputable online pharmacy with a prescription.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 . AdSave Up to 80% on Prescriptions at Over 35, Pharmacies Nationwide with a Free Rx Coupon. Save on 50, Brand Name & Generic Drugs With SingleCare®. Get Your Free Rx Coupon Now!/5 (2, reviews)Site visitors: Over K in the past month. Sildenafil (Viagra) is a medicine used to treat erectile dysfunction (ED, also called impotence). Sildenafil works by helping to relax the blood vessels in the penis, allowing more blood to flow in and cause an erection. You should take sildenafil about an hour before planned sexual activity, so it has time to work.