The little blue pill known as Viagra was intentionally developed as a medication cure of cardio-vascular diseases. Under clinical trials the director Ian Osterloh noticed the unintended side effects that men had a signification increase of blood flow that could improve and sustain a man’s penile erection.
Sildenafil the main active ingredient in Viagra is not a hormone or an aphrodisiac. Viagra was first patented in 1996 and approved by the FDA on March 27, 1998 for treatment of erectile dysfunction. Viagra was the first ED pill for sale in the United States.