Viagra is a popular treatment for impotence or erectile dysfunction. This Sildenafil brand works to help you treat erectile dysfunction so you achieve and maintain a hard erection by increasing the blood flow to your penis.
The ED drugs contains the main active agent Viagra which primarily helps sustain a man’s erection so he can complete sexual intercourse. The use is currently one of the standard treatment for erectile dysfunction today.
Sildenafil inhibits cGMP-specific phosphodiesterase type 5, an enzyme that degrades and regulates blood flow in the penis. Pfizer scientists in the UK originally intended sildenafil as a medication for various cardiovascular problems, such as hypertension, high blood pressure, and angina pectoris.
The initial clinical trials were done in Morriston Hospital in Swansea. Scientists discovered that it had little or no effect on angina, but provides harder erections in the penis. It was marketed in 1998 becoming the first oral medication for erectile dysfunction, eventually raking in a billion dollar success.