Viagra and Impotence

Cialis has an effect much like Viagra as it is the same type of drug with a slightly different chemical formula. The active part of Cialis is called tadalafil. Like Viagra it increases the blood flow to your penis and you get an erection.
The main difference from Viagra is the speed at which it starts [...]

Viagra was the first drug on the market to treat erectile dysfunction. It was developed by the giant pharmaceutical company Pfizer.
It was found by accident. They were looking at drugs to help the heart and realised this drug had an interesting ’side effect’.
Viagra contains the drug sildenafil. This drug is a phosphodiesterase inhibitor. It encourages [...]