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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.
Best Answer: Most of the prescription medications take about an hour to and hour and a half to start to work. You will see the full effect in about two to two and a half hours. These medications work by increasing the blood flow to the penis.iagra (Sildenafil) is a medicine that doctors prescribe to help men who have erectile dysfunction have sex. Erectile dysfunction is the inability of the penis to become rigid (hard), or to stay rigid long enough to finish having sex. Take Viagra 30 minutes to 1 hour before intercourse.