By stopping this enzyme, the drug allows better blood flow into the penis, meaning better erections. This allows the smooth muscles in the penis to relax and fill with blood. 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. Larger amounts of alcohol are a different story. Popular ED medications found online include: Viagra sildenafil : As the first FDA-approved PDE5 inhibitor for ED, sildenafil is taken 30 minutes to four hours before sexual intercourse to help achieve and maintain an erection.Shop VIAGRA at Best Buy. Find low everyday prices and buy online for delivery or in-store pick-up. Price Match Guarantee. For further information, call , visit , or write: Viatris Inc., P.O. Box , Mission, KS See risks & benefits. Learn more about what VIAGRA® . According to price-comparison site , generic Revatio will cost you as little as $ per pill, depending on where you fill your prescription. That’s compared with .

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