The instructions may give a detailed answer to the question who created viagra . In short, in 1996 the American company Pfizer introduced the active ingredient sildenafil citrate, later called Viagra’. The drug was approved by the FDA in 1998;
The instructions may give a detailed answer to the question who created viagra . In short, in 1996 the American company Pfizer introduced the active ingredient sildenafil citrate, later called Viagra’. The drug was approved by the FDA in 1998;