Fildena CT 50 like other Sildenafil-containing medications, works by inhibiting the enzyme PDE5. This leads to increased levels of cyclic guanosine monophosphate (cGMP), resulting in relaxation of the smooth muscles in the blood vessels of the penis. This relaxation facilitates improved blood flow, which can help a man achieve an erection when sexually aroused. The effects of Fildena CT 50 typically begin within 30 minutes to an hour after ingestion. The duration of action can last up to 4-6 hours, during which time a man can potentially achieve and maintain an erection with sexual stimulation. Just like other PDE5 inhibitors, sexual stimulation is essential for Fildena CT 50 to be effective. The medication does not cause an automatic erection but enhances the natural response to sexual arousal.