Tadaflo 10 mg contains tadalafil as its active ingredient. Tadalafil is a phosphodiesterase type 5 (PDE-5) inhibitor. Tadalafil works by inhibiting the action of PDE-5, leading to increased levels of cyclic guanosine monophosphate (cGMP). This, in turn, relaxes the smooth muscles in the blood vessels of the penis, promoting increased blood flow and facilitating an erection when there is sexual stimulation.