Tadalafil, the active ingredient in Vidalista 10 mg, works by inhibiting the phosphodiesterase type 5 (PDE5) enzyme, which normally restricts blood flow to the penis. By blocking this enzyme, Vidalista helps relax the blood vessels in the penis, allowing more blood to flow in and thereby facilitating an erection when sexually stimulated. This leads to improved erectile function, helping men regain their ability to engage in satisfying sexual activity.