Tadalafil, the active ingredient in Vidalista CT 20, is prescribed to males to treat erectile dysfunction. Tadalafil, the main component of Vidalista CT 20, improves blood flow to the penis by relaxing the muscles in the penile blood vessels, which treats erectile dysfunction. It also treats pulmonary hypertension by making it easier for blood to pass through the arteries in the lungs. It lasts up to 36 hours, so take the amount as directed by your doctor, 30 to 60 minutes before engaging in sexual activity. While chewing or crushing the tablet, make sure you consume it whole with milk or water.