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In clinical studies, Viagra began to work in as little as 14 minutes. For most people, though, it began working within 30 minutes. There are a number of factors that can increase or decrease how long Viagra lasts.owever, in most people, Viagra will last for about four hours -- although it generally starts to lose its effectiveness after a couple of hours.
VIAGRA works for men with erectile dysfunction (ED) by increasing blood flow to the penis so you can get and keep an erection hard enough for sex. Individual results may vary. Itâs been proven to help guys with all degrees of ED. VIAGRA usually starts to work within 30â60 minutes.or example, it's associated with medical conditions that can affect blood flow. And when blood flow is affected, it can cause ED. The prostate is a small gland near your bladder. It's next to the nerves that are necessary for an erection to happen.