Compare prices and print coupons for Sildenafil (Generic Revatio and Viagra) and other drugs at CVS, Walgreens, and other pharmacies. Prices start at $Deaths were first reported after approximately one year of use, and hence sildenafil, particularly chronic use, is not recommended in pediatric patients with PAH. In patients with vasoactive pulmonary arterial hypertension, vasodilation of the pulmonary artery leads to reduced resistance to blood flow, with subsequent reductions in mean pulmonary arterial pressure. Your doctor may need to change the doses of your medications or monitor you carefully for side effects. Sildenafil plays a secondary role as an alternative for patients who demonstrate acute vasoreactivity in WHO functional class II to improve their 6-minute walking distance 6MWD and those in functional class III to improve 6MWD and improve the functional class. It continues to work for up to 4 hours, although its action is usually less after 2 hours. The following nonprescription or herbal products may interact with sildenafil: cimetidine Tagamet HB , St.DRUG_DESCRPTION Compare DRUG_NAME prices and find coupons that could save you up to 80% instantly at pharmacies near you such as CVS, Walgreens, Walmart, . Shop male enhancement products at Walgreens. Find male enhancement products coupons and weekly deals. Pickup & Same Day Delivery available on most store items. Buy 1, Get 1 50% OFF Buy 1, Get 1 50% OFF. Extra 15% off $30 Sitewid Not sold at your store. Check other stores Opens a simulated dialog. You should also avoid products you can buy online without a prescription that claim either to be generic forms of sildenafil or to contain sildenafil. (Sildenafil is the active drug in Viagra.Continuing Education Activity Sildenafil is a medication used in the management and treatment of erectile dysfunction and pulmonary arterial hypertension. The recommendation is not to exceed a dose of 25 mg of sildenafil in 48 hours if taking ritonavir. The effects may be increased because of slower removal of the medicine from the body. If you already use medicine for high blood pressure hypertension , sildenafil could make your blood pressure go too low. Ask your pharmacist for a list of the ingredients. Ask your doctor if you have any questions.