Men only take Vilitra 20 mg for erectile dysfunction. An ingredient in this medication called vardenafil helps men achieve a strong erection during sexual activity. Only men who are at least eighteen years old should use this medication. This medication can be taken either before or after a meal. This medication takes 6 hours to take effect. This medication can be taken either before or after a meal. Don't take this medication with cold beverages or fatty meals. Follow your doctor's advice when taking this medication.