Oral Medications 

First-line, non-invasive treatments for erectile dysfunction (ED) include oral medications , such as Viagra® (Sildenafil) , Cialis® (Tadalafil), and Levitra® (Vardenafil). These medications are designed to improve blood flow to the penis by working directly on the blood vessels. They allow the arteries to expand, which could produce an erection. 

Pills are generally taken about an hour to several hours before planned sexual activity, and must be combined with sexual stimulation to provide an erection. Drug treatments have been found to be unsuccessful for 20 to 30 percent of men.

Understanding Erectile Dysfunction