Baclofen Intoxication – A Dangerous Muscle Relaxant

Many pet parents take prescription medications for various health reasons. Despite their best efforts, many of our pets get into the bottles of pills, and often ingest the potentially harmful drugs. One common medication that can be readily toxic and potentially lethal to dogs and cats is a drug called baclofen. This week I share some information about this intoxication to raise awareness, and I hope you find this post helpful. Happy reading!


Baclofen Intoxication – What is it?

is a centrally-acting muscle relaxant typically prescribed to humans to relieve
muscle spasms and pain associated with upper motor neuron spinal cord injuries
and multiple sclerosis. Dogs and cats most commonly become intoxicated after
accidentally ingesting the medication when it is left on the counter or knocked
onto the floor.


mimics a chemical substance in the nervous system called gamma-aminobutyric
acid (GABA). The major result of ingestion of a toxic dose is paralysis of
skeletal muscles. Baclofen doesn’t cause central nervous system signs when
given at therapeutic doses. However, ingestion of toxic levels can be rapidly lethal.

Baclofen Intoxication – What does intoxication look like?

intoxication should be considered in any patient with suspected or known
ingestion of the medication and consistent clinical signs. Common clinical
signs include:

  • Vomiting
  • Drooling (called
  • Panting
  • Recumbency
  • Dilated pupils
    (called mydriasis)
  • Diarrhea
  • Tremors
  • Depression
  • Unsteadiness
    while walking (called ataxia)
  • Vocalization
    & disorientation
  • Difficulty
    breathing (called dyspnea)
  • Seizures
  • Coma

The onset of clinical
signs after ingestion of toxic doses of baclofen may be rapid (30-60 minutes)
or can be delayed for several hours. The duration of clinical signs ranges from
several hours to several days.

Baclofen Intoxication – How is intoxication treated?

Gastrointestinal decontamination is of paramount importance. A veterinarian will attempt to induce vomiting in most intoxicated patients. Doing so, however, in some patients is contraindicated. In such cases, other methods of decontamination will be pursued, including administering a drug called activated charcoal and performing gastric lavage (aka stomach pumping). Anti-convulsant medications will be administered to control seizure activity. A drug called cyproheptadine can be helpful in reducing vocalization and disorientation.

Infusion of an intravenous lipid emulsion may help reduce time in hospital for patients with baclofen intoxication.

Exquisite care must be taken to ensure patients can adequately oxygenate and ventilate. Many patients need to be temporarily placed on a mechanical ventilator, a machine that breathes for them until the drug wears off and they can, once again, breath on its own normally. Infusion of a special medication called intravenous lipid emulsion has been used successfully. Rarely, more invasive interventions like extracorporeal hemodialysis and hemoperfusion (aka: blood cleansing) may be recommended. With adequate ventilation and time, prognosis is considered good with no residual central nervous system effects. Those patients with seizures have a more guarded prognosis

The take-away message about baclofen intoxication in dogs & cats…

and cats get into inappropriate things all the time, including their human
parents’ personal medications. One of these drugs is baclofen, a potent muscle
relaxant. When ingested at toxic doses, skeletal muscles are paralyzed, and
pets develop seizures and may not be able to breathe properly. The prognosis
for an intoxicated pet is generally good if the toxicity is recognized and
treated in a timely fashion.

To speak with veterinary toxicology experts, please visit the ASPCA Animal Poison Control.

To find a board-certified veterinary emergency and critical care specialist, please visit the American College of Veterinary Emergency and Critical Care

Wishing you wet-nosed kisses,