Vidalista 10 belongs to a class of medications called phosphodiesterase type 5 (PDE5) inhibitors. It works by blocking the enzyme PDE5, which typically breaks down cyclic guanosine monophosphate (cGMP), a molecule that helps relax the smooth muscles and dilate blood vessels in the penis. By inhibiting PDE5, Vidalista 10 helps to maintain high levels of cGMP, leading to improved blood flow and better erectile function.