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Population pharmacokinetics of a single dose of meloxicam after oral and intramuscular administration to captive lesser flamingos (Phoeniconaias minor)

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  • 1 Latin American Association of Zoological Parks and Aquariums (ALPZA), Nstra sra del Rosario 165, Las Condes, Santiago, Chile 7560758.
  • | 2 Department of Molecular Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607.
  • | 3 Veterinary Services, Fort Worth Zoo, 1989 Colonial Pkwy, Fort Worth, TX 76109.
  • | 4 Animal Program, Fort Worth Zoo, 1989 Colonial Pkwy, Fort Worth, TX 76109.
  • | 5 Veterinary Services, Fort Worth Zoo, 1989 Colonial Pkwy, Fort Worth, TX 76109.

Abstract

OBJECTIVE To determine the pharmacokinetics of a single dose of meloxicam after IM and oral administration to healthy lesser flamingos (Phoeniconaias minor) by use of a population approach.

ANIMALS 16 healthy captive lesser flamingos between 1 and 4 years of age.

PROCEDURES A single dose of meloxicam (0.5 mg/kg) was administered IM to each bird, and blood samples were collected from birds at 3 (n = 13 birds), 2 (2), or 1 (1) selected point between 0 and 13 hours after administration, with samples collected from birds at each point. After a 15-day washout period, the same dose of meloxicam was administered PO via a red rubber tube and blood samples were collected as described for IM administration. Pharmacokinetic values were determined from plasma concentrations measured by high-performance liquid chromatography.

RESULTS Plasma drug concentrations after IM administration of meloxicam reached a mean ± SD maximum value of 6.01 ± 3.38 μg/mL. Mean area under the concentration-versus-time curve was 17.78 ± 2.79 μg•h/mL, and mean elimination half-life was 1.93 ± 0.32 hours. Plasma concentrations after oral administration reached a mean maximum value of 1.79 ± 0.33 μg/mL. Mean area under the curve was 22.16 ± 7.17 μg•h/mL, and mean elimination half-life was 6.05 ± 3.53 hours.

CONCLUSIONS AND CLINICAL RELEVANCE In lesser flamingos, oral administration of meloxicam resulted in higher bioavailability and a longer elimination half-life than did IM administration, but the maximum plasma concentration was low and may be insufficient to provide analgesia in flamingos. Conversely, IM administration achieved the desired plasma concentration but would require more frequent administration.

Contributor Notes

Address correspondence to Dr. Sánchez (csanchez@fortworthzoo.org).