An improved erection can be achieved by controlling blood flow in blood vessels with the drug Fildena 200. The dosage of Sildenafil Citrate in Fildena 200 is 200 mg. The active component of the PDE inhibitor drug Fildena 200 is sildenafil citrate. It is used to treat erectile dysfunction, a disorder in which the penis is unable to achieve a proper erection. In order to improve erection, Fildena 200 works by controlling blood flow in blood vessels.