Zudena 100 mg (Udenafil) can start working within about 30 minutes in some people, but it is not guaranteed for everyone. How fast it usually works Early onset: ~30–60 minutes (some users feel effects at 30 min) More reliable effect: around 45–90 minutes Peak effect: about 1–2 hours after taking it What affects how fast it works Food: A heavy or fatty meal can delay the effect Body response: Metabolism and age vary from person to person Sexual stimulation: It only works with arousal Alcohol: Can slow or weaken Zudena 100 mg effect How long it lasts Zudena (Udenafil) typically lasts 8–12 hours, sometimes longer in some individuals. Important note Even if it starts working in 30 minutes, it’s usually safer to take it about 1 hour before sexual activity for more consistent results. Safety reminder Do not use with nitrate medicines (for chest pain) and avoid mixing with heavy alcohol, as it can cause a dangerous drop in blood pressure. If you want, I can compare Zudena 100 mg with Sildenafil (Viagra) or Tadalafil (Forzest) so you can see which works faster or lasts longer.