The active ingredient in vidalista, tadalafil, works to active sexual arousal. This drug improves blood flow to the penis with faster and harder erections. Use this medicine only after informing the doctor about your allergies and asking important questions. This medicine should be used one hour before sex. This medicine will give you pleasure of sex for 4-5 hours. Take it with water and do not drink alcoholic beverages after taking this medicine. This drug can be potentially harmful to women and children.