Viagra (sildenafil) is a prescription medication used to treat erectile dysfunction. Headache, flushing, and upset stomach are common Viagra side effects. .If you have certain health conditions or are taking certain medications, your doctor may tell you to take sildenafil less often. If you often forget doses, it may help to set an alarm to remind you. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. If you are taking sildenafil to treat erectile dysfunction, you should know that it does not cure erectile dysfunction or increase sexual desire. Make sure you have discussed any other medications you are currently taking or plan to take before starting sildenafil with your doctor and pharmacist.You can buy sildenafil citrate at the discounted price of $ by using the MDRx coupon, a savings of 43%. Even if this drug is covered by Medicare or your insurance, . Sildenafil (Revatio) is a phosphodiesterase 5 (PDE-5) blocker that relaxes blood vessels in the lungs. This allows blood to flow better and lowers the blood pressure in the lungs. Your heart is able to pump better, your body gets more oxygen, and you should be able to breathe and exercise more easily. PDE-5 blockers also relax blood vessels in. 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 .Dosage and strength for erectile dysfunction Sildenafil tablets for erectile dysfunction come in different strengths ranging from 25mg to mg. If you are taking sildenafil to treat erectile dysfunction, follow your doctor’s directions and the guidelines in this paragraph. John’s wort. Take sildenafil at around the same times every day. This can happen if you are sick with fever, diarrhea, or vomiting; sweat a lot; or do not drink enough liquids. Before starting, stopping, or changing any medications while taking sildenafil, please get the advice of your doctor or pharmacist. Liquid sildenafil will usually be made up for you by your pharmacist.