 In rare instances, delorazepam may cause suicidal ideation and actions.Long term use of delorazepam (as well as all other benzodiazepines) has been found to increase long term cognitive deficits (persisting longer than sixth months) which some researchers claim to be permanent.Short term use may occasionally cause depression and the risk of depressive symptoms occurring increases considerably with longer terms of use, delorazepam is not intended to be used for more than 2–4 weeks unless it used only occasionally on an as-needed basis.