Fildena Super Active is a PDE5 inhibitor, which works by blocking the PDE5 enzyme in the blood vessels of the penis. This enzyme typically breaks down cGMP (cyclic guanosine monophosphate), which is important for relaxing blood vessels and increasing blood flow to the penis. By inhibiting PDE5, Fildena Super Active helps maintain higher levels of cGMP, allowing for better blood flow and making it easier to get an erection when aroused.