Tadora 20 mg works by inhibiting the enzyme PDE5, which is responsible for the breakdown of cyclic guanosine monophosphate (cGMP), a molecule that relaxes the blood vessels in the penis and increases blood flow during sexual arousal. By blocking PDE5, Tadora 20 mg helps maintain higher levels of cGMP, ensuring improved blood flow to the penis and thus, aiding in the achievement of an erection when sexually stimulated.