"Viagra helps to improve erectile function which isn't optimal, " says Pfizer's Dr. The primary measure in the principal studies was a sexual function questionnaire (the International Index of Erectile Function - IIEF) administered during a 4-week treatment-free run-in period, at baseline, at follow-up visits, and at the end of double-blind, placebo-controlled, at-home treatment. Therefore, treatments for erectile dysfunction, including Viagra, should not be generally used in men for whom sexual activity is inadvisable because of their underlying cardiovascular status. They were also asked questions about orgasms, desire, satisfaction with intercourse, and overall sexual satisfaction. For humans, a general rule of thumb is that each hour in time difference between the origin and destination of a flight causes an extra day of jet lag. The usual dose is 50 milligrams ." To gain knowledge about the effects of Viagra, researchers asked men a series of questions about the ability to achieve erections and the ability to maintain an erection after penetration.

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