비아그라에 대한 모든 것

For PAH: Sildenafil operates by calming the muscles and opening up the blood vessels inside your lungs. This decreases the hypertension in the lungs. Sildenafil slows down the progression of one's disease. It also would make you a lot more capable of physical exercise.Sildenafil is really a potent and selective inhibitor of cGMP-specific phosphodie