2023 journal article
Milk residues following multiple doses of meloxicam and gabapentin in lactating dairy cattle
JAVMA-JOURNAL OF THE AMERICAN VETERINARY MEDICAL ASSOCIATION, 261(12), 1873–1879.
author keywords: meloxicam; gabapentin; lactation; postpartum; dairy cattle
TL;DR:
Results of this study suggest that milk from cows treated with multiple doses of meloxicam alone or in combination with gabapentin will have low drug concentrations and falls below the reported limit of detection formeloxicam or gABapentin 120 and 60 hours respectively, following the final dose regardless of their stage of lactation.
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Added: February 19, 2024
Abstract OBJECTIVE To determine the influence of stage of lactation on the pharmacokinetics in milk when multiple doses of meloxicam were administered alone or in combination with gabapentin to postpartum (PP) and mid-lactation (ML) cows. ANIMALS 8 postpartum and 8 mid-lactation dairy cows. METHODS Cows were randomly divided into 2 groups (n = 8) which included 4 PP cows and 4 ML cows. Group I received only 6 oral daily doses of meloxicam (1.0 mg/kg for 6 doses). Group II received 6 oral daily doses of co-administered meloxicam (1.0 mg/kg) and gabapentin (20 mg/kg) for 6 doses. Meloxicam and gabapentin were quantified in plasma and milk samples by ultra–high-performance liquid chromatography–tandem mass spectrometry, and the pharmacokinetic analysis of milk and plasma was performed using a non-compartmental approach. RESULTS Regardless of lactation status, dairy cattle administered multiple doses of meloxicam and/or gabapentin showed low drug residue concentrations and little accumulation in milk. The terminal plasma half-life of meloxicam was significantly increased (P < .02) in PP cows (12.9 hr) compared to ML cows (9.4 hr). The apparent terminal half-life in milk for meloxicam and gabapentin was not affected by stage of lactation. Co-administration of gabapentin did not alter plasma or milk concentrations of meloxicam. CLINICAL RELEVANCE The results of this study suggest that milk from cows treated with multiple doses of meloxicam alone or in combination with gabapentin will have low drug concentrations and falls below our reported limit of detection for meloxicam or gabapentin 120 and 60 hours respectively, following the final dose regardless of their stage of lactation.