Filitra is a medication containing tadalafil, a phosphodiesterase type-5 (PDE-5) inhibitor commonly prescribed for erectile dysfunction (ED) in men. Tadalafil works by enhancing the effects of nitric oxide, which relaxes the smooth muscles in the penis and increases blood flow during sexual stimulation, enabling a firm and sustained erection. One of the key advantages of Filitra is its long duration of action, lasting up to 36 hours, which allows for greater spontaneity compared to shorter-acting ED medications.