Zudena 100 mg contains Sildenafil Citrate, a medication widely used to treat erectile dysfunction (ED) in men. Sildenafil belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors, which work by increasing blood flow to the penis during sexual arousal, helping to achieve and maintain an erection. Zudena 100 mg relaxes blood vessels in the penis by inhibiting the PDE5 enzyme, which allows for better blood flow. It is taken orally, usually about 30 to 60 minutes before sexual activity, and its effects can last for up to 4 to 6 hours. https://www.genericday.com/zudena-100-mg.html