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Viagra® typically lasts in full effect for about two to three hours after you take the pill. Viagra® can work for up to four or five hours, but you will likely notice that its effectiveness starts to decrease after two or three hours. This is because the half-life of Viagra® is about four hours, which means that only half of the drug will still be in your system after that time, reducing its effect on your erection.

Keep in mind that Viagra® is typically not effective until about an hour after you take the drug, so you will need to plan ahead for sex. If you are looking for an ED drug that works around the clock, or might be the best option for you.