Fildena 150 is a medication primarily used to treat erectile dysfunction (ED), a condition characterized by the inability to achieve or maintain an erection sufficient for sexual intercourse. It contains the active ingredient sildenafil citrate, which belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors.

Fildena 120 mg citrate works by inhibiting the enzyme PDE5, which is responsible for the degradation of cyclic guanosine monophosphate (cGMP) in the corpus cavernosum of the penis. This inhibition leads to increased levels of cGMP, which relaxes the smooth muscles of the blood vessels in the penis, allowing for increased blood flow and consequently, an erection when sexually stimulated.