Udenafil is a drug used in urology

Urology

Urology is the medical and surgical specialty that focuses on the urinary tracts of males and females, and on the reproductive system of males. Medical professionals specializing in the field of urology are called urologists and are trained to diagnose, treat, and manage patients with urological...

 to treat erectile dysfunction

Erectile dysfunction

Erectile dysfunction is sexual dysfunction characterized by the inability to develop or maintain an erection of the penis during sexual performance....

. It belongs to a class of drugs called PDE5 inhibitor

PDE5 inhibitor

A phosphodiesterase type 5 inhibitor, often shortened to PDE5 inhibitor, is a drug used to block the degradative action of phosphodiesterase type 5 on cyclic GMP in the smooth muscle cells lining the blood vessels supplying the corpus cavernosum of the penis...

, which many other erectile dysfunction drugs such as sildenafil

Sildenafil

Sildenafil citrate, sold as Viagra, Revatio and under various other trade names, is a drug used to treat erectile dysfunction and pulmonary arterial hypertension . It was originally developed by British scientists and then brought to market by the US-based pharmaceutical company Pfizer...

, tadalafil

Tadalafil

Tadalafil is a PDE5 inhibitor, currently marketed in pill form for treating erectile dysfunction under the name Cialis; and under the name Adcirca for the treatment of pulmonary arterial hypertension...

, and vardenafil

Vardenafil

Vardenafil is a PDE5 inhibitor used for treating erectile dysfunction that is sold under the trade names Levitra and Staxyn.-History:...

 also belong to. It was developed by Dong-A Pharmaceutical and is marketed under the trade name ZydenaTM . It is not approved for use in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 by the U.S. Food and Drug Administration.