Zudena 100 mg Tablet is a brand of medication that contains the active ingredient udenafil, which is used to treat erectile dysfunction (ED). Udenafil can start working within 30 to 60 minutes, but it's essential to remember that sexual stimulation is still required for the medication to be effective. As with any medication, it's essential to consult your healthcare provider before starting Zudena 100 mg Tablet, especially if you have any preexisting conditions or are taking other medications.