Human Medications Toxic to Cats (Reference Table)
A reference table of common human medications toxic to cats, including acetaminophen, ibuprofen, antidepressants, and decongestants, with toxic effects and signs.
Quick answer: Never give a cat any human medication. Acetaminophen (Tylenol) can kill a cat with a single tablet, and ibuprofen, naproxen, aspirin, ADHD stimulants, antidepressants, decongestants, and vitamin D products are all dangerous. If your cat swallows any medication, call a poison hotline now.
ASPCA Animal Poison Control: 888-426-4435 | Pet Poison Helpline: 855-764-7661 (both 24/7, fee may apply)
Cats lack key liver enzymes that humans and dogs use to break down many drugs, so medicines reach toxic levels in cats at doses that would be harmless to other species. The table below lists common human medications, why they harm cats, and the signs to watch for. This page is educational and does not replace your veterinarian or a poison control center.
Human Medications Toxic to Cats
| Medication | Why It Is Toxic to Cats | Signs of Poisoning |
|---|---|---|
| Acetaminophen (Tylenol) | Cats cannot process it; damages red blood cells and liver. One tablet can be fatal. | Brown or blue gums, trouble breathing, facial and paw swelling, vomiting, dark urine |
| Ibuprofen (Advil, Motrin) | NSAID with a very narrow safety margin; causes stomach ulcers and kidney failure. | Vomiting, bloody or black stool, appetite loss, increased or decreased urination |
| Naproxen (Aleve) | Long-acting NSAID; even small amounts cause severe ulcers and kidney damage. | Vomiting, dark stool, weakness, abdominal pain, lethargy |
| Aspirin | Cats clear salicylates very slowly, so it builds up to toxic levels quickly. | Vomiting, appetite loss, rapid breathing, weakness, bleeding |
| ADHD stimulants (Adderall, Ritalin, Vyvanse) | Amphetamines overstimulate the heart and nervous system. | Agitation, tremors, racing heart, high temperature, seizures |
| Antidepressants (Effexor, Prozac, Cymbalta) | Cause serotonin syndrome; cats are oddly attracted to Effexor capsules. | Agitation, loud vocalizing, dilated pupils, tremors, fever, seizures |
| Decongestants (pseudoephedrine, phenylephrine) | Stimulants that spike heart rate and blood pressure. | Restlessness, fast heart rate, tremors, high blood pressure, seizures |
| Vitamin D and psoriasis creams (calcipotriene) | Cause dangerously high calcium and kidney failure, even in tiny amounts. | Increased thirst and urination, vomiting, weakness, appetite loss |
| Cancer creams (fluorouracil, 5-FU) | Extremely toxic; rapidly fatal even from licking a small residue. | Vomiting, tremors, seizures, collapse |
| Benzodiazepines (alprazolam, Xanax) | Can cause heavy sedation, agitation, or liver injury in cats. | Sedation, wobbliness, agitation, vomiting, jaundice |
| Blood pressure and heart meds (beta-blockers, ACE inhibitors) | Cause dangerous drops in heart rate and blood pressure. | Weakness, collapse, slow heart rate, low body temperature |
These hazards are well documented by the ASPCA Animal Poison Control Center and the Pet Poison Helpline, which together field thousands of cat medication calls each year. Acetaminophen, NSAIDs like ibuprofen, and antidepressants are consistently among the most common feline poisonings, and many cases happen when a pill drops to the floor or a cat licks a topical cream.
What to Do in a Medication Emergency
- Do not wait for symptoms. Many toxins act fast, and early treatment saves lives.
- Call ASPCA Animal Poison Control at 888-426-4435 or Pet Poison Helpline at 855-764-7661, available 24/7.
- Have the product name, strength, amount, and time of ingestion ready.
- Do not induce vomiting unless a veterinarian or poison expert tells you to. It can do more harm than good.
- Bring the packaging with you to your vet or the nearest emergency clinic.
Cat-Safe Alternatives Come Only From Your Vet
There is no safe home substitute for veterinary medicine. Cats need feline-specific drugs at feline-specific doses, which only your veterinarian can prescribe. If your cat is in pain, do not reach for anything in your medicine cabinet. Read the signs of discomfort on our guide to recognizing pain in older cats, then call your vet for safe options. Keeping a stocked pet first-aid kit on hand helps you respond calmly in an emergency.
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See also our reference list of human foods toxic to cats, and use the senior cat symptom checker if your cat is showing concerning signs.
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Frequently Asked Questions
Can I give my cat Tylenol or any human pain reliever?
No. Acetaminophen (Tylenol) is one of the most dangerous drugs for cats, and even a single tablet can be fatal because cats cannot process it. Ibuprofen, naproxen, and aspirin are also toxic and cause stomach ulcers and kidney failure. Never give any human pain reliever to a cat. Only a veterinarian can prescribe safe feline pain control.
What happens if a cat eats acetaminophen?
Acetaminophen damages red blood cells and the liver in cats. Signs appear within hours and include brown or blue gums, difficulty breathing, swelling of the face and paws, vomiting, lethargy, and dark urine. This is a life-threatening emergency. Call your vet or a poison control hotline immediately, because fast treatment greatly improves the odds of survival.
Are antidepressants dangerous to cats?
Yes. Many cats are oddly attracted to the smell of certain antidepressant capsules, especially venlafaxine (Effexor). Ingestion can cause serotonin syndrome with agitation, loud vocalizing, dilated pupils, tremors, high body temperature, a racing heart, and seizures. Keep all pills in closed containers, never loose on a nightstand, and call poison control right away if your cat ingests any.
My cat licked a topical cream. Is that a problem?
It can be serious. Vitamin D analog creams for psoriasis (calcipotriene), the cancer cream fluorouracil (5-FU), and pain creams containing NSAIDs are extremely toxic to cats even in tiny amounts. Cats also groom product off their fur. Wash any residue off, prevent more grooming, and contact a poison control hotline or your vet immediately.
What number do I call if my cat eats medication?
Call the ASPCA Animal Poison Control Center at 888-426-4435 or the Pet Poison Helpline at 855-764-7661. Both are staffed 24 hours a day, every day. A consultation fee may apply. Have the product name, strength, amount, and time of ingestion ready, then follow their instructions and contact your veterinarian or an emergency clinic.
Why are cats more sensitive to drugs than dogs or people?
Cats lack certain liver enzymes, especially glucuronidation pathways, that humans and dogs use to break down and clear many drugs. This means medicines build up to toxic levels in cats at doses that would be safe for other species. It is the core reason so many common human and even canine medications are dangerous for cats.
Is there a cat-safe version of these medications?
Safe options exist, but they come only from your veterinarian, who chooses the right drug, dose, and form for your individual cat. Never substitute a human medicine or guess a dose. Vets have feline-approved pain relievers, anti-nausea drugs, and other treatments that are formulated and dosed specifically and safely for cats.
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