One treatment for erectile dysfunction is fildena 25. Male erectile dysfunction, or impotence, is treated with fildena 25 mg. Sildenafil Citrate is the medication's active ingredient. Male erectile dysfunction is treated with sildenafil. Sildenafil is a member of the class of medications known as phosphodiesterase 5 inhibitors. These medications stop phosphodiesterase type-5 from functioning too quickly. Get in touch with your doctor right away if your erection lasts four hours or longer and is painful.