Answer: It depends on the person taking it and what their sexual habits are. Take sildenafil as needed before sexual activity. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Be sure to let your doctor and pharmacist know that you are taking these medications before you start taking sildenafil. What should I do if I forget a dose? Neither Sildenafil nor drugs in the same class are appropriate or safe for women. Perhaps most striking is that the generic will not have the signature blue color.The Savings Offer and Program expire on 12/31/ For further information, call , visit test1.ru, or write: Viatris Inc., P.O. Box , Mission, KS . 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 .  · Sildenafil under the name Viagra is used to treat erectile dysfunction (impotence) in men. Another brand of sildenafil is Revatio, which is used to treat .