TL;DR: Antidepressant ingestion in cats is a life-threatening medical emergency that can lead to fatal Serotonin Syndrome; immediate veterinary intervention is required even if symptoms are not yet present.
What happens if my cat eats a human antidepressant?
Antidepressant ingestion occurs when a cat accidentally consumes human medications such as SSRIs (Selective Serotonin Reuptake Inhibitors), SNRIs, or Tricyclic Antidepressants. Because cats have a much lower body weight and a different metabolism than humans, even a single pill can contain a dose that is toxic or even fatal to a feline.
Is it a medical emergency if my cat ingests an antidepressant?
- High Urgency: This is a life-threatening emergency. Human antidepressants can lead to a dangerous condition called Serotonin Syndrome.
- Recognize Symptoms: Watch for signs such as extreme agitation, tremors, vomiting, high heart rate, seizures, and collapse.
- Immediate Action Required: Do not wait for symptoms to appear before seeking help, as early intervention is critical for a positive outcome.
How can providing a photo of the medication help the emergency veterinarian?
- Saves Time: Having a photo of the medication bottle or specific pill allows the team to act faster.
- Identifies Key Details: A clear image identifies the exact active ingredient, the strength (milligrams), and the potential maximum dose ingested.
- Guides Treatment: This information is vital for calculating toxicity levels and determining the most effective treatment plan immediately upon your arrival.
Clinical Context (Merck Veterinary Manual)
In cases of recent antidepressant ingestion in cats, and if the animal is asymptomatic, emesis should be induced, followed by administration of activated charcoal (even several hours after ingestion) plus a cathartic such as sorbitol or sodium sulfate (magnesium sulfate is contraindicated). Monitor heart rate and rhythm, and treat cardiac arrhythmias as needed; do not use atropine to control bradycardia. Control CNS signs with diazepam or barbiturates; phenothiazines such as acepromazine or chlorpromazine are also options. Manage serotonin syndrome signs as needed, using a serotonin antagonist such as cyproheptadine (2-4 mg per cat, once or twice at an 8-hour interval). Implement thermoregulation with cool water baths and fans, and provide fluid therapy.
Chapter: Toxicology, Emergency
Source: The Merck Veterinary Manual, 11th Edition (Page 3032)