If you experience chest pain, dizziness, or nausea during sexual activity, call your doctor immediately and avoid sexual activity until your doctor tells you otherwise. This medicine is available on prescription and you can also buy it from most pharmacies. Sildenafil comes as a tablet and suspension liquid to take by mouth. If you are taking sildenafil for erectile dysfunction, you are unlikely to miss a dose since this medication is taken as needed, not on a regular dosing schedule. Both Cialis and Viagra work in this way. During 3 to 6 months of double-blind treatment or longer-term 1 year , open-label studies, few patients withdrew from active treatment for any reason, including lack of effectiveness. If it is not treated right away, priapism can permanently damage your penis sudden vision loss in one or both eyes.Currently, there are no over the counter alternatives to Viagra available. Viagra (sildenafil) is a prescription medication, meaning it’s not available over the counter from your local. Compare prices and print coupons for Sildenafil (Generic Revatio and Viagra) and other drugs at CVS, Walgreens, and other pharmacies. Prices start at $ Welcome! You’re in GoodRx Provider Mode. Pay undefined at Walmart with a GoodRx discount. That’s 91% off the retail price of $ Walmart. $ retail. Save 91% $ chevron. The Savings Offer and Program expire on 12/31/ For further information, call , visit , or write: Viatris Inc., P.O. Box , Mission, KS Eligible patients may save on their VIAGRA® (sildenafil citrate) prescription with the VIAGRA savings card.