Zudena 100 mg (active ingredient: udenafil) is usually taken “as needed” before sexual activity, not as a daily medicine. For many men, the recommended timing is: Take 100 mg about 30 minutes before planned sexual activity (some product information allows a window of about 30 minutes to 12 hours before). It should be taken only once in 24 hours unless your doctor has given different instructions. Sexual stimulation is still required; it does not cause an erection without arousal. Tips: It can Zudena 100 Mg be taken with or without food, but a very heavy meal may affect how quickly some people feel the effect. Avoid taking it with nitrate heart medicines (such as nitroglycerin) because the combination can cause a dangerous drop in blood pressure. If you tell me your age, whether you have used sildenafil/tadalafil/vardenafil before, and when you plan to take Zudena 100 mg, I can help compare timing and expected effects.