Tadalista 20 Mg tablets contains Tadalafil, a powerful active ingredient. Tadalafil's mechanism of action involves inhibiting an enzyme called phosphodiesterase type 5 (PDE5). This inhibition leads to increased levels of cyclic guanosine monophosphate (cGMP), a chemical that promotes muscle relaxation and enhances blood flow. As a result, the smooth muscles in the penile region relax, allowing increased blood flow into the penis, leading to a firmer and longer-lasting erection.