Zudena 100 mg is a medication used to treat erectile dysfunction (ED) in men. Its active ingredient is udenafil, which belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. Like other PDE5 inhibitors such as sildenafil (Viagra), tadalafil (Cialis), and vardenafil (Levitra), udenafil works by increasing blood flow to the penis during sexual stimulation. This improved blood flow helps men achieve and maintain an erection. Zudena 100 mg tablets are typically taken orally, with water, about 30 minutes to an hour before sexual activity. The onset of action of udenafil is relatively rapid, with effects lasting for up to 24 hours. https://www.genericday.com/zudena-100-mg.html