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[Pharmacokinetic studies on micronomicin in dogs. Comparison of intramuscular and drip intravenous administration
Abstract:
The pharmacokinetics of micronomicin (MCR) were studied in dogs after intramuscular (i.m.) and drip intravenous (d.i.v., 0.5, 1 and 2 hours) administration (10 mg/kg). After i.m. administration, the plasma levels of MCR followed a one-compartment open model, and after d.i.v. administration it followed a two-compartment open model. The peak plasma levels of MCR after i.m., 0.5, 1 and 2 hours d.i.v. administration were 28.7 +/- 6.5, 36.7 +/- 3.6, 30.2 +/- 5.1 and 20.3 +/- 2.3 mcg/ml, respectively. The pharmacokinetic parameters (T1/2, AUC, Kel, Vd and Cl) of MCR except Cmax and Tmax were not differentiated by the route of administration. Urinary recovery of MCR after d.i.v. administration was equal to that of MCR after i.m. administration.
Insights
This study investigated micronomicin (MCR) pharmacokinetics in dogs. Results showed similar urinary recovery and key pharmacokinetic parameters regardless of intramuscular or intravenous administration, suggesting flexible dosing options for MCR.
Area of Science:
- Pharmacology
- Drug Metabolism and Pharmacokinetics
Background:
- Micronomicin (MCR) is an aminoglycoside antibiotic.
- Understanding MCR pharmacokinetics is crucial for optimizing therapeutic efficacy and safety.
Purpose of the Study:
- To investigate the pharmacokinetics of micronomicin (MCR) in dogs following different administration routes.
- To compare key pharmacokinetic parameters between intramuscular (i.m.) and drip intravenous (d.i.v.) administration of MCR.
Main Methods:
- Dogs were administered MCR (10 mg/kg) via i.m. and d.i.v. routes (0.5, 1, and 2 hours).
- Plasma MCR levels were monitored over time.
- Pharmacokinetic parameters including T1/2, AUC, Kel, Vd, and Cl were calculated.
- Urinary recovery of MCR was assessed.
Main Results:
- MCR plasma levels followed a one-compartment model after i.m. administration and a two-compartment model after d.i.v. administration.
- Peak plasma levels (Cmax) varied with administration route and duration.
- Key pharmacokinetic parameters (T1/2, AUC, Kel, Vd, Cl) were not significantly different between administration routes.
- Urinary recovery of MCR was comparable for both i.m. and d.i.v. administration.
Conclusions:
- The route of administration does not significantly alter major pharmacokinetic parameters of MCR in dogs, except for Cmax and Tmax.
- Urinary recovery is consistent across different administration methods.
- These findings support the potential for flexible dosing strategies for MCR.