It lasts 4 to 5 hours, or longer if you have mild to moderate ED. When oral medications might not be safe Check with your health care team before you take any medicine for erectile dysfunction. Its effects often last for 4 to 5 hours. Take sildenafil exactly as directed. By controlling the enzyme, sildenafil helps to maintain an erection after the penis is stroked. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand.It’s a prescription drug that’s used in adult males* with ED. With ED, you have trouble getting or keeping an erection. To find out more about how Viagra is used . On this page Highlights for sildenafil Sildenafil oral tablet is available as a brand-name drug and as a generic drug. Brand names: Viagra, Revatio. Sildenafil . Why is this medication prescribed? Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men.

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