Zudena 100 mg is a medication used primarily to treat erectile dysfunction (ED) in men. Udenafil works by increasing blood flow to the penis during sexual arousal, helping to achieve and maintain an erection. It is important to note that Zudena 100 mg will only work when there is sexual arousal. It does not cause spontaneous erections but rather enhances the body’s natural response to sexual stimuli. Zudena 100 mg tablet typically starts to work within 30–60 minutes of taking the tablet, although this can vary depending on individual factors such as metabolism and whether the tablet is taken with food.