비아그라 비아그라의 기본 원리

For PAH: Sildenafil works by relaxing the muscles and opening up the blood vessels in your lungs. This decreases the blood pressure level inside your lungs. Sildenafil slows down the development of the illness. In addition it can make you much more able to exercising.When you’ve by now had NAION or have crowded optic disc, you may have an increas