Why a 5 kg cat reacts differently to a crumb than a dog would
Baclofen's danger scales with body weight, and cats process drugs far slower than dogs. What looks like a harmless crumb to us delivers a concentrated dose to a small feline system. Your 5 kg cat doesn't have the mass to dilute the drug's effects—neurological symptoms often appear before gastrointestinal ones, so waiting for vomiting means you're already behind the crisis.
The sensitive stomach might trigger earlier vomiting than usual, but that's no comfort. Baclofen suppresses the central nervous system directly, so while the stomach reacts, the real damage happens as the drug crosses into the brain. Wobbliness or dilated pupils mean it's already disrupting motor control.
The first hour decides the outcome
Baclofen absorbs rapidly, with effects sometimes visible within 30 minutes. At this stage, the priority isn't managing diarrhea but preventing respiratory failure. Watch for slowed breathing rates—less than 20 breaths per minute in a resting cat signals immediate danger. The drug's muscle-relaxing properties can weaken the diaphragm's contractions.
Don't wait for symptoms to 'see how bad it gets.' Cats deteriorate suddenly with neurotoxins; the transition from mildly unsteady to comatose can happen faster than you can call a vet. Time matters more than the dose when the substance is this potent per gram of body weight.
Why sensitive stomachs complicate treatment
A cat prone to digestive upset may vomit the fragment partially digested, but that doesn't reduce the risk—some drug will have already absorbed through the stomach lining. Dehydration from vomiting also concentrates the toxin in the bloodstream. Emergency vets need to know about the stomach sensitivity because anti-nausea injections could interact with the Baclofen.
IV fluids become critical both to support kidney function and to counteract fluid loss from vomiting. Mention any past episodes of food intolerance or medication reactions—it helps the vet adjust supportive care without delaying the main treatment for poisoning.
What you can't see is already happening
While diarrhea seems like the obvious threat, Baclofen's silent effects are more dangerous. It disrupts GABA receptors, slowing nerve signals to muscles—including those controlling the heart and lungs. A cat may seem merely sleepy while blood oxygen drops dangerously low. Pulse oximeters made for humans often fail on feline paws, so don't rely on home checks.
Watch the gums: pale or bluish tints mean oxygen starvation. The drug's peak effects hit 2-3 hours post-ingestion, but delaying vet care risks permanent damage. Even if symptoms seem mild now, the next hour could bring seizures or coma without medical intervention.
The step-by-step response, from the first minute to the vet visit, is in our Muscle Relaxants (Baclofen, Cyclobenzaprine) emergency guide.