The following nonprescription or herbal products may interact with sildenafil: cimetidine Tagamet HB , St. Before starting, stopping, or changing any medications while taking sildenafil, please get the advice of your doctor or pharmacist. Continue to take sildenafil even if you feel well. What special precautions should I follow? Other uses for this medicine This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information. This site is intended only for U. When oral medications might not be safe Check with your health care team before you take any medicine for erectile dysfunction.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 . Cost Overdose Ask your doctor Q&A Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a . The Savings Offer and Program expire on 12/31/ For further information, call , visit , or write: Viatris Inc., P.O. Box , Mission, KS .