Sexual activity may be a strain on your heart, especially if you have heart disease. Do not take more or less of it or take it more often than prescribed by your doctor. Do not take a double dose to make up for a missed one. Sildenafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow easily. Oral ED medicines might not work or might be dangerous if you also take any of the following: Nitrate medicines.AdBrowse & discover thousands of brands. Read customer reviews & find best sellers. Free shipping on qualified orders. Free, easy returns on millions of test1.ru has been visited by 1M+ users in the past month. 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, and . Sildenafil mg price. Sildenafil is a phosphodiesterase inhibitor used for the treatment of erectile dysfunction. Sildenafil is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. It treats erectile dysfunction by increasing blood flow to the penis during sexual stimulation.