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Ask Dr. Michael Salkin Your Own Question

Dr. Michael Salkin
Dr. Michael Salkin, Veterinarian
Category: Vet
Satisfied Customers: 24367
Experience:  University of California at Davis graduate veterinarian with 44 years of experience.
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How long until Metacam takes effect rabbit? She has an ear infection. She has arthri

Customer Question

How long until Metacam takes effect for a rabbit? She has an ear infection. She has arthritis and was started on Bactrim antibiotics for her ear infection. She is tilting her head to the side and we heard her grinding her teeth. It has been over an hour. She didn't seem to be grinding her teeth until after we gave her the Metacam. We aren't sure of the source of her pain or if she is. We've had to force feed her critical care, but she has eaten some blueberries, apple, banana, a little hay today.
Submitted: 7 months ago.
Category: Vet
Expert:  Dr. Michael Salkin replied 7 months ago.
AbstractAmerican Journal of Veterinary ResearchFebruary 2014, Vol. 75, No. 2, Pages 195-199doi: 10.2460/ajvr.75.2.195 Pharmacokinetics of meloxicam administered orally to rabbits (Oryctolagus cuniculus) for 29 daysKatie W. Delk, DVM; James W. Carpenter, MS, DVM; Butch KuKanich, DVM, PhD; Jerome C. Nietfeld, DVM, PhD; Micah Kohles, DVM, MPADepartment of Clinical Sciences, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506. (Delk, Carpenter); Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506. (KuKanich); Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506. (Nietfeld); Oxbow Animal Health,***** Murdock, NE 68407 (Kohles)Dr. Delk's present address is Veterinary Teaching Hospital, University of California-Davis, Davis, CA 95616.Supported by Oxbow Animal Health.Presented in abstract form at the 35th Annual Association of Avian Veterinarians Conference, Jacksonville, Fla, August 2013, and at the 12th Annual Conference of the Association of Exotic Mammal Veterinarians, Indianapolis, Ind, September 2013.The authors thank Christine Hackworth, ***** *****ez, Drew Pearson, Nolan McClain, Amy Guernsey, and Caitlin Kozel for assistance with sample collection and analysis.Address correspondence to Dr. Delk (*****@******.***).Objective—To determine the pharmacokinetics and safety of meloxicam in rabbits when administered orally for 29 days.Animals—6 healthy rabbits.Procedures—Meloxicam (1.0 mg/kg, PO, q 24 h) was administered to rabbits for 29 days. Blood was collected immediately before (time 0) and 2, 4, 6, 8, and 24 hours after drug administration on days 1, 8, 15, 22, and 29 to evaluate the pharmacokinetics of meloxicam. On day 30, an additional sample was collected 36 hours after treatment. Plasma meloxicam concentrations were quantified with liquid chromatography–mass spectrometry, and noncompartmental pharmacokinetic analysis was performed. Weekly plasma biochemical analyses were performed to evaluate any adverse physiologic effects. Rabbits were euthanatized for necropsy on day 31.Results—Mean ± SD peak plasma concentrations of meloxicam after administration of doses 1, 8, 15, 22, and 29 were 0.67 ± 0.19 μg/mL, 0.81 ± 0.21 μg/mL, 1.00 ± 0.31 μg/mL, 1.00 ± 0.29 μg/mL, and 1.07 ± 0.19 μg/mL, respectively; these concentrations did not differ significantly among doses 8 through 29. Results of plasma biochemical analyses were within reference ranges at all time points evaluated. Gross necropsy and histologic examination of tissues revealed no clinically relevant findings.Conclusions and Clinical Relevance—Plasma concentrations of meloxicam for rabbits in the present study were similar to those previously reported in rabbits that received 1. 0 mg of meloxicam/kg, PO every 24 hours, for 5 days. Results suggested that a dosage of 1. 0 mg/kg, PO, every 24 hours for up to 29 days may be safe for use in healthy rabbits. According to this study, an appreciable blood level of meloxicam was found as early as 2 hours after dosing and maintained for a full 24 hours. Please respond with further questions or concerns if you wish.

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