Viagra is the Brand name for Sildenifil. It is a vasodilator that is most often used as a means to treat Erectile Dysfunction. It typically comes in the form of a small blue or purple pill that can be taken orally. It can also be used to treat pulmonary hypertension.

Viagra is known to potentially cause a number of side effects such as headaches, congestion, indigestion, photo phobia, and priapism.