Long-lasting single-dose tolerance to neurologic deficits induced by diazepam

Development of single-dose tolerance to diazepam-induced neurologic deficits was assessed in mice by means of a rotarod test. Diazepam suspended in corn oil was administered orally in doses 5-20 mg/kg. Tolerance was found following a second administration of diazepam 24 h after a first dose. It decayed gradually over 4-5 weeks. Hence tolerance persists considerably longer than measurable amounts of diazepam or its metabolites are likely to be present in mice.