· For treatment of erectile dysfunction: For oral dosage form (tablets): Adults up to 65 years of age—50 milligrams (mg) as a single dose no more than once a day, 1 .Also tell your doctor if you or any of your family members have or have ever had an eye disease such as retinitis pigmentosa an inherited eye condition that causes loss of vision or if you have ever had sudden severe vision loss, especially if you were told that the vision loss was caused by a blockage of blood flow to the nerves that help you see. Ask your pharmacist for a list of the ingredients. Follow your doctor’s orders or the directions on the label. Its effects often last for 4 to 5 hours. If you are a Mayo Clinic patient, this could include protected health information.Drug Images 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 . · Viagra is usually taken only when needed, 30 minutes to 1 hour before sexual activity. You may take it up to 4 hours before sexual activity. Do not take Viagra more . Why is this medication prescribed? Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men.This, in my view, is the key issue in this appeal. Recent heart or blood vessel problems. Sildenafil does not prevent pregnancy or the spread of sexually transmitted diseases such as human immunodeficiency virus HIV. These small differences affect the way each medication works, such as how quickly it takes effect and wears off, and the possible side effects. Be sure to let your doctor and pharmacist know that you are taking these medications before you start taking sildenafil.
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