A medication called vidalista 40 mg Medicine is used to treat impotence and erectile dysfunction in males.Tadalafil, a component in this medication, helps men achieve a powerful erection during sexual activity. Children and women should not use this medication. Take this medication forty to forty-five minutes before having sex. This medication takes 36 hours to take effect. Cold beverages and fatty meals should not be consumed with this medication as they will decrease its effectiveness. Follow your doctor's advice when taking this medication. This medication can be used either before or after food.