Human medications toxic to cats: what to do if your cat ate a pill

Human medications toxic to cats are behind some of the most common poisoning calls. In 2025, over-the-counter medicines and supplements were the number one reason people called ASPCA Poison Control about their pets, and prescription drugs came third. Pet Poison Helpline says nearly half of its calls involve human medicines. Many of these cases start with a dropped pill, a chewed bottle or an owner trying to help a cat in pain.

Why are human medications toxic to cats?

A cat’s liver works differently from ours. Cats have a very limited ability to process many drugs through a pathway called glucuronidation, so drugs that people clear quickly can build up in a cat and turn into toxic by-products. A tablet made for an adult person is also a huge amount for a small animal.

That’s why “safe for children” doesn’t mean safe for cats. Even over-the-counter and herbal products can seriously poison a pet. Never give your cat any human medicine unless your vet has told you to. When a vet does use a human drug for a cat, they choose the product and set the dose for that cat. Learn more about the drugs vets prescribe in our cat medications guides.

Which human medications are most dangerous to cats?

Treat any human medicine your cat swallows as urgent, and call for advice. These are the groups vets and poison lines see most often.

Even for lower-risk drugs like statins, call a poison line. You may not know exactly which pill your cat ate, or whether it got into something else from the same cupboard.

Why is acetaminophen (Tylenol) so dangerous for cats?

Acetaminophen, also called paracetamol, is one of the most dangerous drugs a cat can swallow. Pet Poison Helpline warns that one regular-strength tablet may damage a cat’s red blood cells so they can’t carry oxygen properly. It can also cause liver failure.

The blood changes start within a few hours. Signs include:

• brown, muddy or bluish gums
• fast or labored breathing (see cat breathing fast)
• swelling of the face or paws
• weakness, lethargy and not eating
• vomiting
• low body temperature

Acetaminophen hides in many products labeled for “cold and flu”, “allergies” or “fever”, and in some prescription pain pills. Check the ingredients of anything your cat got into, not only the brand name.

What about ibuprofen, naproxen and aspirin?

These are NSAIDs (non-steroidal anti-inflammatory drugs). Pet Poison Helpline says even one or two pills can cause serious harm, including stomach and intestinal ulcers and kidney failure. Cats react to ibuprofen at about half the amount that poisons a dog, and they may be even more sensitive to naproxen than dogs are. They also clear aspirin very slowly, so it builds up.

Signs of ibuprofen poisoning include vomiting, diarrhea with blood, changes in how much your cat pees, depression and, in severe cases, coma. Kidney damage can leave a cat with lasting kidney disease.

Vets sometimes prescribe aspirin for cats at risk of blood clots from heart disease, on a strict dose and schedule they set. That’s exactly why you should never guess at one yourself.

Are antidepressants and ADHD drugs dangerous to cats?

Yes. Antidepressants and ADHD medicines were among the prescription drugs pets swallowed most in 2025, according to ASPCA Poison Control.

• Antidepressants can cause sedation, wobbliness, tremors and seizures. Some also act as stimulants, pushing up heart rate, blood pressure and body temperature. Pet Poison Helpline notes that cats seem to like the taste of venlafaxine and often eat the whole pill, and just one can cause serious poisoning.
• ADHD medicines contain strong stimulants. Even a small amount can cause life-threatening tremors, seizures, overheating and heart problems.
• Sleep aids can cause severe drowsiness, walking “drunk” and slowed breathing. Some pets become agitated instead.

Are cold and flu medicines safe for cats?

No. Cold, sinus and allergy products often combine several drugs, and some contain acetaminophen as well. Decongestants such as pseudoephedrine can cause enlarged pupils, a racing heart, high blood pressure, agitation, tremors, head bobbing and hiding, and they can kill. Signs can last 1 to 4 days. Phenylephrine mostly causes vomiting, but agitation and high blood pressure are possible too.

Antihistamines in these products can cause either sleepiness or hyperactivity, drooling, fast breathing, a fast heartbeat and, in serious cases, tremors and seizures. If your cat has a cold, ask your vet what’s safe rather than sharing yours.

Can creams on my skin poison my cat?

Yes, and this is the exposure owners miss most often. Cats can lick cream off your skin, groom it off their own fur after rubbing against you, or chew into a tube. Merck notes that cats are more sensitive than dogs to NSAID creams, especially with repeated contact.

• Fluorouracil (5-FU) is a cream or solution for skin cancers and sun damage. The FDA warns that even a small amount can make a pet very sick or kill it. Signs can start within 30 minutes and include vomiting, diarrhea, tremors and seizures. There’s no antidote.
• NSAID pain creams such as flurbiprofen made cats in two households ill or killed them after owners put the cream on their own neck or feet, not on the cat.
• Hormone creams and patches containing estrogen can suppress a cat’s bone marrow.
• Psoriasis creams with calcipotriene, a form of vitamin D, can cause kidney failure and death from a lick or taste.

If you use any of these, wash your hands after applying, ask your doctor whether to cover the treated skin, throw away applicators and empty tubes in a closed bin, and keep your cat off your lap until the cream has been washed off or covered.

Is vitamin D dangerous for cats?

Yes. Vitamin D (cholecalciferol) is in many multivitamins and calcium supplements, and it’s also the active ingredient in some rat poisons (see our guide to household items toxic to cats). Too much raises calcium in the blood. Vomiting, depression, heavy thirst and peeing a lot can appear within 12 hours, followed by sudden kidney failure 1 to 2 days after the cat ate it. Treatment can take many days, so early care matters.

My cat ate a pill: what should I do?

1. Move your cat away and pick up any pills, pieces or packaging you can find. Count what’s missing.
2. Call a vet or pet poison line now. Pet Poison Helpline is on (855) 764-7661 and ASPCA Poison Control on (888) 426-4435. Both charge a consultation fee.
3. Have the packet ready. Read out the drug name, the strength, how many might be gone, when it happened and roughly what your cat weighs.
4. Don’t make your cat vomit. Home methods can injure a cat. Your vet may do it at the clinic with a medicine that’s safe for cats.
5. Don’t wait for signs. Some drugs cause harm hours or days later.
6. Bring the packaging if you’re told to go in. Find a clinic open now in our vet directory, or see what to do in an emergency.

Emergency care costs more than a regular visit. Our guide to emergency vet costs explains what to expect, but don’t let cost delay the call. If you’re unsure how urgent something is, our should I go to the vet? check can help.

How do I keep my medicines away from my cat?

Cats often swallow pills left on nightstands and counters, or ones dropped on the floor.

• Store pill organizers in a closed cabinet. Some pets treat them as chew toys.
• Don’t keep loose pills in plastic bags. They’re easy to chew through.
• Look for dropped pills right away. Take tablets over a table or sink so a dropped one is easy to find.
• Keep your medicines apart from your cat’s. Poison lines often hear from owners who gave their own tablet by mistake.
• Hang up bags and purses, and ask guests to do the same with theirs.
• Put creams and tubes away straight after use, including empty ones.

For other dangers around the house, browse our is it safe for cats? guides.

Written by the CatsMed Team from the sources above. This guide isn’t reviewed by a veterinarian and isn’t a substitute for one. See how we research.