Fildena 150 mg is a prescription drug that belongs to a class called phosphodiesterase type 5 (PDE5) inhibitors. It contains the active ingredient Sildenafil Citrate, which helps increase blood flow to the penis and supports a firm and long-lasting erection. Fildena 150 is mainly prescribed for men who have trouble achieving and maintaining an erection, a condition known as erectile dysfunction (ED).