Generic versions of sildenafil, vardenafil and tadalafil are available. If you have an erection that lasts more than 4 hours, get medical help right away. These medicines all work well for ED. The body takes longer to absorb it after a high-fat meal or alcohol. It lasts 4 to 5 hours, or longer if you have mild to moderate ED.The Savings Offer and Program expire on 12/31/ For further information, call , visit test1.ru, or write: Viatris Inc., P.O. Box , Mission, KS . It really depends based on the person. Most of the time, Viagra starts to work after 30 minutes. Some people note that Viagra works faster when taken on an empty stomach. The effects of Viagra usually last around 4 to 5 hours, in which time it is easier to have an erection. But in some cases, this window of time See more. Sildenafil (Viagra) is a phosphodiesterase-5 (PDE-5) inhibitor. PDE-5 is a protein in your body that breaks down the molecules that normally cause an erection. .

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