L. Montoya

A pharmacokinetic comparison of meloxicam and ketoprofen following oral administration to healthy dogs

AbstractKetoprofen (KTP) and meloxicam (MLX) are non-steroidal anti-inflamatory drugs used extensively in veterinary medicine. The pharmacokinetics of these drugs were studied in eight dogs following a single oral dose of 1 mg/kg of KTP as a racemate or 0.2 mg/kg of MLX. The concentrations of the drugs in plasma were determined by high-performance liquid chromatography (HPLC). There were differences between the disposition curves of the KTP enantiomers, confirming that the pharmacokinetics of KTP is enantioselective. (S)-(+)-KTP was the predominant enantiomer; the S:R ratio in the plasma increased from 2.58±0.38 at 15 min to 5.72±2.35 at 1 h. The area under the concentration–time curve (AUC) of (S)-(+)-KTP was approximately 6 times greater than that of (R)-(–)-KTP. The mean (±SD) pharmacokinetic parameters for (S)-(+)-KTP were characterized as Tmax = 0.76±0.19 h, Cmax = 2.02±0.41 μg/ml, t

A non-surgical jugular catheterization technique for multiple blood sampling in cats

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Chronopharmacological study of cephalexin in dogs.

= 1.65±0.48 h, AUC = 6.06±1.16 μg.h/ml, Vd/F = 0.39±0.07 L/kg, Cl/F = 170±39 ml/(kg.h). The mean (±SD) pharmacokinetic parameters of MLX were Tmax = 8.5±1.91 h, Cmax = 0.82±0.29 μg/ml, t

Pharmacokinetics and bone tissue concentrations of lincomycin following intravenous and intramuscular administrations to cats.

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Pharmacokinetics and bioavailability of a long-acting formulation of cephalexin after intramuscular administration to cats

= 12.13±2.15 h, AUCinf = 15.41±1.24 μg.h/ml, Vd/F = 0.23±0.03 L/kg, and Cl/F = 10±1.4 ml/(kg.h). Our results indicate significant pharmacokinetic differences between MLX and KTP after therapeutic doses.

Pharmacokinetics of cefuroxime after intravenous, intramuscular, and subcutaneous administration to dogs.

Ketamine is commonly administered in combination with benzodiazepines to achieve surgical anaesthesia in rats. The aim of the present study was to analyze the pharmacological response of the combination ketamine–midazolam injected intraperitoneally at different times of day to rats. The study was conducted in July 2003, during the winter in the Southern hemisphere. Female prepuberal Sprague-Dawley rats synchronized to a 12 h light:12 h dark cycle (light, 07:00–19:00 h) were used as experimental animals. A combination treatment of ketamine (40 mg/kg) and midazolam (2 mg/kg) was administered to five different clock-time groups of rats (n = 7/group). Duration of the latency period, ataxia, loss-of-righting reflex (LRR), post-LRR ataxia, and total pharmacological response were assessed by visual assessment. Significant treatment-time differences were detected in the duration of LRR, post-LRR ataxia, and total pharmacological response duration. The longest pharmacological response occurred in rats injected during the light (rest) phase, and the shortest pharmacological response occurred in rats injected during the dark (activity) phase. Cosinor analysis documented circadian rhythmicity in the duration of post-LRR ataxia. The findings of the study indicate the duration of CNS-depression of the ketamine–midazolam combination exhibits treatment-time-dependent variation in the rat.