The invention concerns the use of an H1- and/or H2-histamine receptor antagonist for the reduction of intracranial pressure (ICP) in particular for the prevention and treatment of elevated intracranial pressure and/or secondary ischaemia in particular caused by brain injury more in particular caused by traumatic (TBI) and non-traumatic brain injury. In particular the histamine antagonist is selected from the group of acrivastine alimemazine antazoline astemizole azatadine azelastine brompheniram...