Imidazoline

Imidazoline

Medications

Alternate names

Oxymetazoline, tetrahydrozoline, naphazoline, nasal sprays, nasal decongestants, Afrin, ophthalmic preparation, Visine, eye drops, Alpha-2 Agonists

Toxicity to pets

Imidazoline decongestants are topical vasoconstrictors (constricts blood vessels). Imidazolines (like oxymetazoline and tetrahydrozoline) are commonly found in over-the-counter eye drops and nasal sprays. When a bottle of product containing imidazolines is chewed, it can result in severe poisoning in pets – even death, when untreated. Even a small ingestion can cause clinical signs of vomiting, lethargy/depression or agitation, ataxia (incoordination), hypotension, and a life-threatening low heart rate. Immediate veterinary attention should be sought following ingestion. Please contact your veterinarian or Pet Poison Helpline for life-saving advice if your pet has ingested one of these common eye drops or nasal sprays.

Common signs to watch for:

  • Vomiting
  • Lethargy or depression
  • Agitation
  • Incoordination
  • low blood pressure
  • Life-threatening low heart rate

 

Imidazoline

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Dogs

Toxicity Level

Severe

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Cats

Toxicity Level

Severe

Birds

Toxicity Level

Severe

Disclaimer

The content of this page is not veterinary advice. A number of factors (amount of substance ingested, size of the animal, allergies, etc.) determine what is toxic to a particular pet. If you think your pet has eaten something potentially toxic, call Pet Poison Helpline or seek immediate veterinary treatment.