Tadaflo 20 mg is a medicine used for the treatment of erectile dysfunction (a condition that occurs when a man has difficulty getting and/or keeping an erection firm enough for sexual intercourse). It is also used to treat urinary symptoms caused due to an enlargement of the prostate gland (a walnut-sized gland located just below the bladder that secretes fluid to nourish and transport the sperm) in older men. Tadaflo 20 mg works by relaxing the blood vessels in the penis, increasing the flow of blood to the penis.