Fildena 120 mg is a medication that typically contains sildenafil citrate as its active ingredient. Sildenafil is a phosphodiesterase type 5 (PDE5) inhibitor commonly used to treat erectile dysfunction (ED) in men.Sildenafil citrate is the primary active ingredient in Fildena 120 mg. It works by increasing blood flow to the penis during sexual stimulation, facilitating the ability to achieve and maintain an erection.