Fildena 100 mg is a specific dosage of Fildena, a medication that contains sildenafil citrate as its active ingredient. It is primarily used to treat erectile dysfunction (ED) in men, helping them achieve and maintain an erection during sexual activity. Fildena 100 mg contains 100 mg of sildenafil citrate, which is a PDE5 inhibitor. This means it works by blocking the enzyme phosphodiesterase type 5 (PDE5) in the penis, which allows for increased blood flow during sexual arousal. As a result, it helps men with ED to achieve a natural erection when sexually stimulated.