If you are taking sildenafil for erectile dysfunction, your doctor will probably start you on an average dose of sildenafil and increase or decrease your dose depending on your response to the medication. Flibanserin is not approved in Australia. This medicine has been approved in the United States to treat premenopausal females who have low sexual desire. Most erectile dysfunction medications belong to the drug class known as PDE5 inhibitors , which help relax the muscles and increase blood flow to allow for a full erection. Viagra can be taken as long as four hours or as little as 30 minutes before sex.Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in is also used to treat pulmonary arterial hypertension, a serious heart and lung drug is more popular than comparable drugs. It is available in generic and brand versions. Generic sildenafil is covered by most Medicare and insurance plans, but . 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. Use GoodRx to look up prices and discount coupons at pharmacies in South Carolina and save up to 80% with our free coupons. Even if you have insurance or Medicare, GoodRx’s discount prices are often lower than your co-pay. Look up the cost of your prescription to start saving now: Find Drug Prices.