Can I give my dog Tylenol (acetaminophen)?
Not without a prescription. Human painkillers can damage your dog's liver, stomach and kidneys, and they're even more dangerous for cats. This guide doesn't replace a vet.
Reviewed by Paola De Valeri, veterinarian, October 17, 2026.
Never give it without a prescription
- Acetaminophen (Tylenol, called paracetamol in Mexico): damages the liver and the blood. In cats, a single pill can be fatal.
- Ibuprofen, naproxen, diclofenac and aspirin: cause stomach ulcers and kidney damage, even in small doses.
- Cold and flu pills, decongestants and cough syrups: many combine acetaminophen with other substances that are toxic to pets.
- Sleep, anxiety or ADHD medication, and any medicine prescribed to someone else.
A medicine made for children isn't safe for your dog either.
What about metamizol (dipyrone)?
Metamizol, also called dipyrone and sold in Mexican pharmacies, is used by some vets in dogs, but the dose depends on its weight, health and other medication. A human pill can be too much, and in cats it's used with great care.
If your vet already prescribed it, follow the instructions exactly. If not, don't give it on your own.
If you already gave it or it ate a pill
- 1. Call your vet right away. Even if it looks fine. A lot of the damage shows up hours or days later.
- 2. Have the box at hand. The name of the medicine, the milligrams, how many pills and what time. With that, the vet works out the risk.
- 3. Don't make it vomit on your own. Only if your vet tells you to, and how they tell you.
If you think it's in pain or has a fever
- Signs of pain: limping, not letting you touch it, panting at rest, hiding or not eating.
- Take its temperature before assuming a fever: normal is 38 to 39.2 °C (100.4 to 102.6 °F).
- Call your vet: there are painkillers made for dogs and cats that are safe at the right dose.
Frequently asked questions
- Can I give my dog Tylenol for pain?
- Not without a prescription. Acetaminophen can damage its liver and blood. There are safe painkillers for dogs: ask your vet.
- Can I give my dog Tylenol for a fever?
- No. First confirm the fever with a thermometer (over 39.5 °C or 103.1 °F) and call your vet: fever is a sign of another illness that needs checking.
- What happens if my dog ate ibuprofen?
- Call your vet right away and have the box at hand. Ibuprofen causes ulcers and kidney damage, sometimes with no symptoms at first.
- Is metamizol (dipyrone) safe for dogs?
- Only at the dose a vet sets. It's used in dogs, but a human pill can be too much for its weight.
Related guides
- How to tell if your dog is sickSigns of fever, dehydration, poisoning and parvo in dogs, and when to go to the emergency vet.
- What dogs can eat and what's toxicFruits and foods dogs can eat, the toxic ones and what to do if your dog ate one.
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Sources
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