Once you take it, Viagra reaches peak concentrations in about an hour and lasts for approximately 4 hours. So, you could take it as much as 4 hours before intercourse, but you may not see maximum effectiveness at the time of intercourse. PDE-5 inhibitors widen blood vessels in your penis https://bydbdautogroup49371.anchor-blog.com/5972398/the-make-viagra-last-longer-diaries