Udenafil is primarily used in the treatment of erectile dysfunction (ED) in men. It works by enhancing blood flow to the penis during sexual stimulation, facilitating the achievement and maintenance of an erection. This makes it effective for individuals experiencing difficulties due to physical or psychological factors. Additionally, udenafil has been studied for its potential benefits in managing pulmonary arterial hypertension (PAH) by relaxing the blood vessels in the lungs, thereby improving exercise capacity and reducing symptoms. Its longer duration of action compared to some other ED medications allows for greater flexibility in timing sexual activity. It is typically taken orally as needed, and its use should be guided by a healthcare professional to ensure safety and efficacy.