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Related Experiment Videos

Melatonin administration to dogs

J Sääf, L Wetterberg, M Bäckström

    Journal of Neural Transmission
    |January 1, 1980
    PubMed
    Summary

    Oral melatonin in dogs is rapidly absorbed, with peak serum levels within 30 minutes. Canine melatonin pharmacokinetics, including a 5-hour elimination half-life, mirror human data, suggesting similar metabolic pathways.

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    Area of Science:

    • Veterinary Pharmacology
    • Endocrinology
    • Pharmacokinetics

    Background:

    • Melatonin is a hormone crucial for regulating circadian rhythms.
    • Understanding melatonin's behavior in different species is vital for comparative physiology and potential therapeutic applications.

    Purpose of the Study:

    • To investigate the pharmacokinetics of orally administered melatonin in dogs.
    • To compare canine melatonin concentrations and rhythms with those observed in humans.

    Main Methods:

    • Oral administration of four different melatonin doses (10-80 mg/kg) to dogs.
    • Measurement of serum and urine melatonin concentrations over time.
    • Analysis of absorption, distribution, and elimination parameters.

    Main Results:

    • Melatonin was rapidly absorbed, reaching peak serum concentrations within 20-30 minutes.
    • The elimination half-life (t1/2) was approximately 5 hours, with a distribution phase of 3.5 hours.
    • Only 0.25% of the administered dose was excreted in urine within the first 5 hours.

    Conclusions:

    • Oral melatonin exhibits rapid absorption and a predictable pharmacokinetic profile in dogs.
    • Canine serum melatonin concentrations and diurnal rhythms closely resemble human patterns.
    • Findings support the similarity in melatonin metabolism and action between dogs and humans.

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