Mechanism of Action Tadalista 20 belongs to a class of medications known as phosphodiesterase type 5 (PDE5) inhibitors. The active ingredient, tadalafil, works by inhibiting the action of PDE5, an enzyme that plays a role in the regulation of blood flow. By inhibiting PDE5, Tadalista 20 promotes relaxation of the smooth muscles in the blood vessels of the penis, leading to increased blood flow....