· Drug information provided by: Merative, Micromedex® US Brand Name. Revatio; Viagra; Descriptions. Sildenafil is used to treat men who have erectile .Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. What side effects can this medication cause? Other uses for this medicine This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information. Ask your pharmacist for a list of the ingredients. From Mayo Clinic to your inbox Sign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health.Availability. Available. See GoodRx coupons. warning. Are you looking for information on sildenafil (Revatio) instead? What is Sildenafil (Viagra)? Drug Facts. .  · Drug information provided by: Merative, Micromedex® US Brand Name. Revatio; Viagra; Descriptions. Sildenafil is used to treat men who have erectile . What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription drug that’s used in adult males* with .If you are taking sildenafil to treat erectile dysfunction, follow your doctor’s directions and the guidelines in this paragraph. Ask your pharmacist for a list of the ingredients. Sildenafil usually should not be taken more than once every 24 hours. If you are taking sildenafil for PAH, take the missed dose as soon as you remember it. What special dietary instructions should I follow? Your doctor will tell you not to take sildenafil if you are taking street drugs containing nitrates. This product is available in the following dosage forms: Tablet Suspension There is a problem with information submitted for this request.