Erectile Dysfunction (Impotence; ED) By Irvin H Hirsch, MD, Sidney Kimmel Medical College of Thomas Jefferson University Reviewed / Revised Mar 2022 | Modified Sep 2022 View Patient Education Etiology Diagnosis Treatment Key Points Topic Resources Commonly Used Drugs That... Oral Phosphodiesterase Type... Erectile dysfunction is the inability to attain or sustain an erection satisfactory for sexual intercourse.