Zudena 100 mg tablet typically starts to work within 15 to 30 minutes after taking the tablet. The effects can last for about 6 to 8 hours, but this can vary depending on individual factors like metabolism, overall health, and sexual stimulation. Keep in mind that the medication helps achieve an erection only when there is sexual arousal. It’s always best to follow your healthcare provider’s guidance regarding dosage and use. If you have further questions about its effects or how it might work for you, consider consulting with a healthcare professional.