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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.
The usual recommended dose is 50 mg, but in some cases your doctor may recommend taking either more or less than the average dose. Viagra pills are available in either 25 mg, 50 mg, or 100 mg tablets. The maximum recommended dose is 100 mg. Do not take more than this at once. 2. Take Viagra 30 to 60 minutes before sex. Viagra is most effective when taken in this time frame, since it takes a little while for the medication to circulate and stimulate an erection. However, Viagra may be taken up to 4 hours before sexual activity and still be effective. 3. Don't take Viagra more than once a day.