Vilitra 40 tablets work in men’s bodies until 36 hours or may work 72 hours. So when you forget to take the Cialis dose, don’t worry about it. You can take skipped dose the next day. Do not take two doses of also; do not take it when you have no plan for sex. You cannot take this medicine every day. So if you miss a dose, you can take it the next day at night To avoid side effects, you need to make sure your doctor is on your side when you take the pills. Vardenafil, a PDE-5 inhibitor, can react with some medicines and certain diseases.