Pharmacokinetics of an immediate and extended release oral morphine formulation utilizing the spheroidal oral drug absorption system in dogs
| Autor: | J. S. Gaynor, D. Wilson, Mark G. Papich, C. L. Aragon, M. R. Read, M. D. Barnhart |
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| Rok vydání: | 2009 |
| Předmět: |
Drug
Male Time Factors media_common.quotation_subject Administration Oral Pain Absorption (skin) Pharmacology Dogs Pharmacokinetics Blood plasma medicine Animals Dosing Chromatography High Pressure Liquid media_common General Veterinary Dose-Response Relationship Drug Morphine Chemistry Half-life Analgesics Opioid Dose–response relationship Delayed-Action Preparations Female medicine.drug Half-Life |
| Zdroj: | Journal of veterinary pharmacology and therapeutics. 32(2) |
| ISSN: | 1365-2885 |
| Popis: | This study investigated the pharmacokinetics of a human-labeled oral morphine formulation consisting of both immediate and extended release components in dogs. In a randomized design, 14 dogs were administered either 1 or 2 mg/kg morphine orally. Blood samples were collected up to 24 h post drug administration. Plasma concentrations of morphine were measured using high-pressure liquid chromatography with electrochemical coulometric detection. For both groups, maximal concentration occurred at 3 h post drug administration followed by a gradual decrease in morphine concentration over 24 h. There was substantial variability in morphine concentrations among dogs. The higher dose group produced a greater exposure (higher area-under-the-curve), higher peak concentration, longer half-life and a shorter time to peak concentration (t(max)). The specific oral morphine formulation used in this study produced sustained plasma morphine concentrations over 24 h compared with previous intravenous dosing and immediate-release oral morphine studies. However, the low morphine plasma concentrations and high variability produced from this formulation, suggest that the clinical application of this formulation at the doses evaluated in this study are limited. |
| Databáze: | OpenAIRE |
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