Fildena 200mg (Fildena Double) is used to treat male sexual function problems (impotence or erectile dysfunction-ED). In combination with s*xual stimulation, sildenafil works by increasing blood flow to the p*nis to help a man get and keep an erection. Yes, taking Fildena 200mg medicine is completely safe unless you will have the right amount of this medicine as prescribed by the doctor to you.