비아그라의 5가지 필수 요소

Revatio: This drug is utilized to treat PAH. With PAH, the blood pressure level within your lungs is simply too large. Your heart has to work very difficult to pump blood into your lungs.Sildenafil is really a potent and selective inhibitor of cGMP-specific phosphodiesterase type five (PDE5), which happens to be chargeable for degradation of cGMP d