It can be taken 30 min to 4 hours before desired intercourse. Consider starting at a dose of 25 mg in patients with hepatic dysfunction e. Advise patients to seek prompt medical care in the event of a sudden loss of hearing or decrease while taking sildenafil. You are encouraged to report adverse events related to Viatris products by calling U. Sildenafil plays a secondary role as an alternative for patients who demonstrate acute vasoreactivity in WHO functional class II to improve their 6-minute walking distance 6MWD and those in functional class III to improve 6MWD and improve the functional class.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. Viagra is absorbed quickly into your body. It can start working within 30 minutes, but it may take a couple hours for some people. However, one study on Viagra found that about 70% of men achieved erections in 30 minutes, and more than 80% of men achieved erections within 45 minutes. For most men, the effects of Viagra will start within . Generic Viagra (sildenafil) is available as a , , , and milligram (mg) pill and in liquid form. It’s meant to be taken as needed — about an hour before sex — but shouldn’t be.