title: Disposition of HI-6 oxime in rats after intravenous and intramuscular administration.
abstract: The pharmacokinetics of HI-6, a cholinesterase-reactivating oxime, were studied in rats, following intravenous or intramuscular administration. A two-compartment model was used to analyse the intravenous data and a one-compartment open model with first-order absorption was used for intramuscular data. Drug concentration had no influence on rate and extent of absorption of intramuscular injections, and bioavailability was 100%. Peak plasma concentrations of HI-6 occurred 15 min after intramuscular injection. No significant differences were found between mean values for half-life, plasma clearance, volume of distribution and area under the plasma concentration versus time curve for the two intramuscular doses and the intravenous dose used. Mean HI-6 plasma concentrations were 140.5 +/- 4.2 micrograms ml-1 3 min after 20 mg ml-1 i.v., with a mean elimination half-life of 65.2 +/- 21 min. Plasma clearance rate was 3.95 +/- 0.93 ml min-1 kg and the apparent volume of distribution was 0.38 +/- 0.17 litre kg-1. The oxime is rapidly distributed in and eliminated by rats when administered intravenously or intramuscularly.
authors.forename: K J
authors.initials: KJ
authors.lastname: Simons
authors.forename: C J
authors.initials: CJ
authors.lastname: Briggs
mesh_terms: D000818:Animals; D000931:Antidotes / Q000008:administration & dosage / Q000378:metabolism*; D001682:Biological Availability; D006207:Half-Life; D007273:Injections, Intramuscular; D007275:Injections, Intravenous; D007700:Kinetics; D008297:Male; D010091:Oximes; D011726:Pyridinium Compounds / Q000008:administration & dosage / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D000931:Antidotes; D010091:Oximes; D011726:Pyridinium Compounds; C022870:asoxime chloride