It mainly occurs due to the decreased blood flow in the penile veins. Vidalista contains Tadalafil as its main active ingredient, which helps increase the blood flow in the penis veins by relaxing and smoothening the muscles and blood vessels inside the penis. The medication belongs to a category of drugs called PDE-5 (Phosphodiesterase-5) inhibitors. PDE 5 is an enzyme that does not let the blood flow into the penis veins, causing problems in achieving or keeping an erection. Vidalista blocks the action of this enzyme and enables the production of cGMP molecules, resulting in an erection. Vidalista is also used for the treatment of Benign Prostate Hyperplasia. It is an age-associated condition in which the size of the prostate gland increases, causing difficulties in urination. Vidalista is available in many doses, so it is crucial to consult with a doctor to find out which dose is the best for you. The medication should be taken 30-60 minutes before getting involved in sexual intercourse. The effects of Vidalista can last for around 36 hours. Please consult with your doctor for the best direction of using the medicine.