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Intramuscular bioavailability of chlorazepate as compared to diazepam
European Journal of Clinical Pharmacology
|January 1, 1985
Summary
Intramuscular administration of dipotassium chlorazepate (DPC) and diazepam (DZM) showed high bioavailability. DPC achieved 104% bioavailability, while DZM reached 85% via the intramuscular route in healthy volunteers.
Area of Science:
- Pharmacology
- Clinical Pharmacy
- Drug Metabolism
Background:
- Benzodiazepines like dipotassium chlorazepate (DPC) and diazepam (DZM) are commonly used for their anxiolytic and sedative properties.
- Understanding the bioavailability of different administration routes is crucial for optimizing therapeutic efficacy and patient dosing.
Purpose of the Study:
- To compare the bioavailability of intramuscular (i.m.) versus intravenous (i.v.) administration of DPC and DZM in healthy human subjects.
- To quantify the pharmacokinetic profiles of DPC and DZM following i.m. and i.v. routes.
Main Methods:
- Six healthy volunteers received i.m. and i.v. doses of 20 mg DPC and 15 mg DZM, with at least a one-week washout period between administrations.
- Plasma concentrations of DPC and DZM were quantified using High-Performance Liquid Chromatography (HPLC).
- Area Under the Curve (AUC) values were calculated to determine bioavailability.
Main Results:
- Intramuscular administration of DPC resulted in a bioavailability of 1.04 (104%).
- Intramuscular administration of DZM yielded a bioavailability of 0.85 (85%).
- HPLC analysis provided precise quantification of drug plasma levels for pharmacokinetic assessment.
Conclusions:
- Intramuscular injection is a viable route for DPC administration, demonstrating complete bioavailability.
- Intramuscular administration of DZM shows significant, but not complete, bioavailability compared to intravenous injection.
- These findings support the potential use of intramuscular benzodiazepines in clinical settings where rapid absorption or alternative administration is needed.