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Related Experiment Videos

5-Hydroxytryptophan toxicosis in dogs: 21 cases (1989-1999).

S M Gwaltney-Brant1, J C Albretsen, S A Khan

  • 1ASPCA National Animal Poison Control Center, Urbana, IL 61802, USA.

Journal of the American Veterinary Medical Association
|June 23, 2000
PubMed
Summary

Accidental ingestion of 5-hydroxytryptophan (5-HTP) in dogs can cause severe neurologic and gastrointestinal signs, mimicking human serotonin syndrome. Prompt veterinary treatment is crucial for recovery from 5-HTP toxicosis.

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Area of Science:

  • Veterinary Toxicology
  • Canine Pharmacology
  • Animal Health

Background:

  • 5-hydroxytryptophan (5-HTP) is a precursor to serotonin, a neurotransmitter.
  • Accidental ingestion of 5-HTP supplements can occur in dogs.
  • Understanding the toxic effects of 5-HTP in dogs is important for veterinary care.

Purpose of the Study:

  • To characterize the epidemiologic features of 5-hydroxytryptophan (5-HTP) toxicosis in dogs.
  • To identify clinical signs associated with 5-HTP toxicosis.
  • To evaluate the treatment outcomes for dogs with 5-HTP toxicosis.

Main Methods:

  • A retrospective study design was employed.
  • Data were collected from 21 dogs with confirmed accidental 5-HTP ingestion via the National Animal Poison Control Center database.

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  • Records were reviewed for signalment, ingested dose, clinical signs, treatments, and outcomes.
  • Main Results:

    • Ninety percent of dogs (19/21) developed clinical signs of toxicosis.
    • Common signs included neurologic (seizures, tremors, ataxia) and gastrointestinal (vomiting, diarrhea) symptoms, along with hyperthermia.
    • The minimum toxic dose was 23.6 mg/kg, and the minimum lethal dose was 128 mg/kg; 16 of 17 treated dogs recovered.

    Conclusions:

    • 5-hydroxytryptophan (5-HTP) ingestion in dogs can lead to a life-threatening condition similar to human serotonin syndrome.
    • Clinical signs can manifest rapidly (within 10 minutes to 4 hours) and persist for up to 36 hours.
    • Aggressive and prompt veterinary intervention, including decontamination and supportive care, is essential for successful outcomes.