Cialis Vs Viagra

In 1993, the Bothell, Washington biotechnology company ICOS Company began studying chemical substance IC351, a phosphodiesterase type 5 enzyme inhibitor. In 1994, Pfizer scientists uncovered that sildenafil, which also inhibits the PDE5 enzyme, induced penile erection in men participating in a medical study of a heart medication. Although ICOS researchers were not evaluating mixture IC351… Continue reading Cialis Vs Viagra