Viagra one hour before having sex. However, studies have suggested that it could start working even sooner than that. Some men were able to achieve an erection just 12 minutes after taking Viagra, although this wasn’t conclusively proven to be due to Viagra. And while the maximum concentration of sildenafil in the blood isn’t reached until about an hour after taking it (and is potentially delayed by an additional hour if taken with food), it took a median of 27 minutes (with a range of 12–70 minutes) for men taking sildenafil to begin experiencing erections. This was 23 minutes sooner than the median time of 50 minutes experienced by those who took a placebo.
• Viagra one hour before having sex. However, studies have suggested that it could start working even sooner than that. Some men were able to achieve an erection just 12 minutes after taking Viagra, although this wasn’t conclusively proven to be due to Viagra. And while the maximum concentration of sildenafil in the blood isn’t reached until about an hour after taking it (and is potentially delayed by an additional hour if taken with food), it took a median of 27 minutes (with a range of 12–70 minutes) for men taking sildenafil to begin experiencing erections. This was 23 minutes sooner than the median time of 50 minutes experienced by those who took a placebo.
• The half-life of Viagra in the body is about four hours, meaning that every four hours after taking it, there’s only half as much of the drug left. However, even 10 to 12 hours after taking Viagra, men could still often achieve erections hard enough for penetration, though of a shorter duration. By 24 hours, all traces of Viagra in the blood are practically gone.
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