Toxic to dogs · Medications

Is Imidazoline toxic to dogs?

Extreme severity No safe amount — No amount is considered safe.

Yes. Even a small amount can be life-threatening — treat any exposure as an emergency and contact a vet immediately.

Symptoms to watch for

  • Vomiting
  • Lethargy
  • Depression
  • Agitation
  • Ataxia
  • Incoordination
  • Hypotension
  • Low blood pressure
  • Life-threatening low heart rate
  • Bradycardia

How vets treat it

Immediate veterinary attention should be sought following ingestion. Contact a veterinarian or poison control center for life-saving advice.

Why it's dangerous

Imidazolines act as topical vasoconstrictors and alpha-2 agonists that constrict blood vessels and can cause severe systemic depression of the cardiovascular and central nervous systems.

Toxic compound: Oxymetazoline, tetrahydrozoline, naphazoline

Good to know

Even a small ingestion can result in severe poisoning or death if untreated. Common sources include over-the-counter eye drops and nasal sprays.

Sources

This page is informational and is not veterinary advice. If your pet has been exposed to something risky, contact your vet or an animal poison control line right away.

More substances toxic to dogs

5-fluorouracil (5-FU) Extreme severity Amphetamines Extreme severity Antibiotics Extreme severity Antihistamines Extreme severity Everything toxic to dogs →

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