“…15,17,45,46,56,68 Case series describe generalized hypersensitivity and even myoclonus with very high opioid doses, intrathecal administration, or concomitant phenothiazines. 13,23,24,29,36,37,43,53,60,61,64,65 Clinical diagnostic criteria for OIH have been proposed, but OIH incidence, dose threshold, and time course remain uncertain. 3,28 Does OIH produce a new pain, expand the topography of existing pain, increase pain above pretreatment levels, manifest as declining relief from each opioid dose, or some combination of the above?…”