How Does Viagra Woks?

It is recommended that Viagra should be consumed at least one hour before any sexual activity. The Viagra pill has a half life of four hours which means that the effects of this medication begin to wither off after a period of four hours. This drug can stay in the body for much longer period as well. The time duration varies from person to person. If a person's metabolic rate is slow (as seen in old men), the medicine can stay in the system for long. Connect with me for more info via my website – PowerPoint PPT presentation