The disease Peyronie’s is complicated, and it has both physical and mental effects on guys who have it. Scar tissue forms under the skin, which makes the penis curve or bend when you have an erection. This curve can cause pain, trouble getting an erection, and stress during sexual exercise. Viagra (sildenafil), on the other hand, is a well-known drug used to treat erectile dysfunction (ED) by making the penis get more blood.