Zudena 100 mg tablet is a medication that contains the active ingredient Udenafil, which is used to treat erectile dysfunction (ED). The 100 mg tablet is one of the common dosages. Avanafil works by increasing blood flow to the penis during sexual stimulation, helping to achieve and maintain an erection. Its effects can last up to 6 hours, making it a flexible option for many men. It should not be used with nitrates or certain other medications. Always consult a healthcare provider for personalized advice.