Vidalista CT 20 treats erectile dysfunction, a medical condition in which the penis is unable to achieve a strong erection when a man is sexually aroused. The main ingredient in this medicine is tadalafil. This drug relaxes the blood vessels and helps increase blood flow to the muscles. It is advised to take this medicine one hour before planning intercourse to improve your sex life. The effect of this medicine usually lasts for 3 to 4 hours. You can also take this medicine on an empty stomach to make this medicine more effective. Using this medicine improves your sex life.