Fildena 120 mg is a medication containing the active ingredient Sildenafil Citrate, commonly used to treat erectile dysfunction (ED) in men. Like other medications with Sildenafil Citrate, Fildena 120 mg works by increasing blood flow to the penis during sexual stimulation, helping men achieve and sustain an erection. Sildenafil Citrate in Fildena 120 mg inhibits the action of phosphodiesterase type 5 (PDE5), an enzyme that normally breaks down cGMP. By inhibiting PDE5, Sildenafil helps maintain higher levels of cGMP, prolonging the dilation of blood vessels and sustaining the erection.