How many kind of viagra
The major product of metabolisation by these enzymes is N-desmethylated sildenafil, which is metabolised further. Pfizer to lose patent of drug Viagra, Indian companies gear up with copycat versions: Pfizer’s patent for the formulation of Viagra, used to treat impotence in men, ends in the US in 2020″. Sildenafil citrate and blood-pressure-lowering drugs: results of… Read More »