Vilitra 40 is a medication that contains vardenafil, which is commonly prescribed for erectile dysfunction (ED). It works by increasing blood flow to the penis during sexual arousal. The most noticeable sign is improved ability to maintain an erection. A man taking Vilitra 40 may experience stronger and longer-lasting erections during sexual activity. While taking vardenafil, a man may experience side effects like headaches, dizziness, or facial flushing. These effects occur because of the increased blood flow or the body's reaction to the medication.