Vilitra 20 is a prescription medication used to treat erectile dysfunction, and it should only be used under the guidance and supervision of a healthcare provider. They can provide personalized advice regarding dosage, timing, and usage based on your specific needs and health status. If you have any questions or concerns about the duration of effect or usage of Vilitra 20, consult with your healthcare provider for further guidance. https://www.genericday.com/vilitra-20-mg.html