Cost: Branded Viagra starts at $80 per dose and can be purchased in a day or day supply. Sildenafil is also available through the Optum Store for $6 per dose, but a higher .The major circulating metabolite results from N-desmethylation of sildenafil, and is itself further metabolized. However, if you take sildenafil with a high-fat meal, it will take longer for the medication to start to work. Also tell your doctor if you have or have ever had pulmonary veno-occlusive disease PVOD; blockage of veins in the lungs ; a stomach ulcer; heart, kidney, or liver disease; a heart attack; heart failure; angina chest pain ; an irregular heartbeat; a stroke; chest pain; high or low blood pressure; high cholesterol; a bleeding disorder; blood circulation problems; blood cell problems such as sickle cell anemia a disease of the red blood cells , multiple myeloma cancer of the plasma cells , or leukemia cancer of the white blood cells ; conditions affecting the shape of the penis e. You need a prescription from a doctor to obtain sildenafil. What special dietary instructions should I follow? These patients had erectile dysfunction at baseline that was characterized by median categorical scores of 2 a few times on principal IIEF questions.VIAGRA does not protect against sexually transmitted diseases, including HIV. The most common side effects of VIAGRA: headache; flushing; upset stomach; This Savings Offer is limited to 50% savings off the amount of your co-pay or your out-of-pocket cost, whichever is less, with a maximum savings of $ off each prescription for up to Headache, flushing, and upset stomach are common Viagra side effects. These effects are usually mild and often resolve on their own. While rare, Viagra can cause an erection that lasts longer than 4 hours (priapism). This can result in permanent damage if left untreated. Vision changes are also possible. How much does Sildenafil (Viagra) cost? To access savings, use a GoodRx coupon and pay just a fraction of the retail price. Viagra (brand) savings_outlined. GoodRx lowest price. $ (save %) Sildenafil (Viagra) (generic) savings_outlined. GoodRx lowest price. $ (save %).Sildenafil at steady state, at a dose not approved for the treatment of erectile dysfunction 80 mg t. Take sildenafil at around the same times every day. What special dietary instructions should I follow? However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Rarely reported side effects include: an erection that will not go away priapism. It is eliminated predominantly by hepatic metabolism mainly CYP3A4 and is converted to an active metabolite with properties similar to the parent, sildenafil. The pattern of responses was similar for the other principal question, the ability to achieve an erection sufficient for intercourse.