Tadagra 20 mg is a brand name for a medication containing tadalafil, which is commonly used to treat erectile dysfunction (ED) in men. Tadalafil is also used to manage benign prostatic hyperplasia (BPH) and pulmonary arterial hypertension (PAH). It works by relaxing the blood vessels, which increases blood flow to the penis, helping to achieve and maintain an erection during sexual activity.