Zudena 100 mg tablet, which contain udenafil, are primarily used for the treatment of erectile dysfunction (ED) in men. Treating ED can improve confidence and reduce anxiety related to sexual performance, contributing to better sexual health and relationships. Udenafil is a phosphodiesterase type 5 (PDE5) inhibitor, which relaxes blood vessels in the penis, allowing for increased blood flow during sexual arousal. It is usually taken about 30 to 60 minutes before sexual activity.