Tadalafil, the primary and active ingredient in Vidalista 40 mg, relaxes blood vessels and increases blood flow to certain areas of the body. Tadalafil, sold as Cialis, is completely contraindicated for use in women and is intended for the treatment of erectile dysfunction (ED) in men. Additionally, it is approved by the US FDA to treat ED-related BPH disorders as well as the signs and symptoms of benign prostatic hyperplasia (BPH). Depending on your physical condition, your doctor may change the recommended dose of tadalafil from 20 mg to 40 mg or 60 mg per day. Before taking the medicine, read the contents carefully and make sure that you are not allergic to any of them. Patients with heart disease, renal and liver disease, high or low blood pressure, and other physical conditions should tell their doctor immediately because it can be dangerous.