Short general description of Zudena Zudena, also known as udenafil, is a medication primarily used to treat erectile dysfunction in men. It belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. Zudena works by increasing blood flow to the penis, allowing men to achieve and maintain an erection during sexual stimulation. It is a commonly prescribed medication for men who have difficulty getting or keeping an erection. One of the main advantages of Zudena is its long duration of action. Unlike some other erectile dysfunction medications, Zudena can provide erection support for up to 24 hours after …