Cats metabolize many drugs differently than dogs or humans. Medications considered safe for people can cause methemoglobinemia, liver failure, kidney damage, or death in cats at surprisingly small doses. Human pain relievers are responsible for a large portion of feline medication poisoning cases seen at emergency clinics.
Most dangerous medications
Acetaminophen (paracetamol/Tylenol) is among the most lethal. A single regular-strength tablet can kill a cat. Cats cannot conjugate the toxic metabolite, which destroys red blood cells and liver tissue. Non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen and naproxen cause gastric ulceration and acute kidney failure. Antidepressants, ADHD medications, sleep aids, and topical pain creams containing flurbiprofen or lidocaine are also common culprits.
How exposure happens
Dropped pills on the floor are quickly batted and chewed by curious cats. Owners sometimes administer human medication assuming a lower dose is safe. Topical creams applied to a person’s skin can transfer to a cat during cuddling and be ingested through grooming. Pill organizers left open on counters are another frequent source.
Symptoms by drug type
Acetaminophen poisoning produces brown or muddy-colored gums, facial and paw swelling, rapid breathing, and lethargy within hours. NSAID toxicity causes vomiting (possibly with blood), dark tarry stool, abdominal pain, and reduced urine output. Stimulant medications trigger hyperactivity, tremors, elevated heart rate, and seizures. Sedatives cause profound lethargy, low body temperature, and respiratory depression.
What to do
Contact a veterinarian or animal poison control immediately. Identify the medication, the approximate amount, and the time of exposure. Do not induce vomiting in a cat without veterinary direction, as cats are more prone to aspiration. Bring the medication packaging to the clinic.
Prevention
Store all medications in closed cabinets, not on counters or nightstands. Pick up dropped pills immediately. Never give a cat any medication without veterinary approval. Keep purses and travel bags zipped, as they often contain loose pills. Dispose of unused medications in sealed containers rather than open trash bins.
Veterinary disclaimer: This article is for general education only and does not replace an examination by a licensed veterinarian. If your cat has been exposed to human medication, seek emergency veterinary care without delay.