비아그라에 대해 거의 알려지지 않은 사실

Sildenafil belongs to a category of prescription drugs called phosphodiesterase type five (PDE5) inhibitors. A category of medicine is a bunch of drugs that operate in an identical way. These medication tend to be used to take care of related situations.If you’ve by now had NAION or have crowded optic disc, you'll have a greater hazard for NAION