Zudena 100 mg is a medication used for the treatment of erectile dysfunction (ED) in men. It contains udenafil as its active ingredient. Udenafil is a phosphodiesterase type 5 (PDE5) inhibitor, similar to other medications used to treat ED such as sildenafil (Viagra), tadalafil (Cialis), and vardenafil (Levitra). Udenafil works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which regulates blood flow to the penis. By blocking PDE5, udenafil increases blood flow to the penis during sexual stimulation, leading to an erection. The usual recommended dosage of Zudena is 100 mg, taken orally as needed, approximately 30 minutes before anticipated sexual activity. The dosage may be adjusted based on individual response and tolerability, with a maximum recommended dose of 200 mg.