Fildena 120 tablet contains a comparable substance compound to other Fildena drug classes, which is sildenafil citrate. The drug's main activity is to limit protein phosphodiesterase within the blood vessel divider supplying the penis. This medicine is for oral use only. It is recommended to take the medicine at least as prescribed by the doctor before you plan to have sex. If you miss a dose, do not take two doses at once. Avoid alcoholic beverages, grapefruit, illegal drugs, and heavy foods before taking this traditional medicine for impotence. Above all, take this medicine once in a 24-hour time frame.