title: Mice tolerant to nitrous oxide are not tolerant to barbiturates.
abstract: Mice continuously exposed to 50% nitrous oxide for 2 weeks or more become tolerant to nitrous oxide, as measured by an 8% to 19% increase in their nitrous oxide ED50 (the dose required to abolish the righting reflex in 50% of the animals). Control mice tolerant to nitrous oxide were given intraperitoneal injections of secobarbital (50 mg/kg), phenobarbital (120 mg/kg), or pentobarbital (55 or 65 mg/kg). Sleep onset times, sleep times, and serum levels of barbiturates upon awakening did not differ between the two groups. These results suggest that nitrous oxide and barbiturates do not share a common mechanism of action.
mesh_terms: D000769:Anesthesia, Inhalation; D000771:Anesthesia, Intravenous; D000818:Animals; D001463:Barbiturates / Q000097:blood; D004361:Drug Tolerance; D008297:Male; D051379:Mice; D009609:Nitrous Oxide / Q000008:administration & dosage; D010424:Pentobarbital / Q000097:blood; D010634:Phenobarbital / Q000097:blood; D012631:Secobarbital / Q000097:blood; D013997:Time Factors
chemical_list: D001463:Barbiturates; D012631:Secobarbital; D010424:Pentobarbital; D009609:Nitrous Oxide; D010634:Phenobarbital