text: Cerebral edema may occur if a person has been hypoglycemic for a long time or other causes. The intravenous injection is that of an osmotic diuretic mannitol  (that causes loss of water from the body by osmotic pressure method-- that is first removal of water from the brain into the blood vessels and then exerting it's osmotic effects in the renal tubule..). which take cares of the edema.....which otherwise can prove fatal.\n                                                                Waqar(FUMC-Pakistan)