Fildena 50 is a medication used to treat erectile dysfunction (ED) in men. It contains the active ingredient Sildenafil citrate, which is a phosphodiesterase type 5 (PDE5) inhibitor. Sildenafil works by improving blood flow to the penis when a man is sexually aroused, enabling him to achieve and maintain an erection. Fildena 50 contains 50 milligrams of Sildenafil citrate per tablet. This is considered a moderate-strength dose and is often prescribed as an initial or standard dosage for individuals with ED.