Veterinarian-written / veterinarian-approved articles for your cat.

Medications That Are Dangerous to Cats


According to the Pet Poison Hotline website, close to 50% of the calls they receive regarding toxic ingestions in pets involve human medications (Top 10 Human Medications Poisonous to Pets). This may occur when a cat or kitten scarfs up a dropped pill, gets into the medicine cabinet and helps herself, or is actually given a human medication by a well-meaning owner.

It’s important to keep in mind that cats are not humans. Cats’ systems are exquisitely sensitive to a wide variety of medications, and they lack the enzymes necessary to effectively break down and eliminate many human drugs from their bodies. Cats are also not small dogs, and some medications that our canine companions can take safely are toxic to our feline friends.

While veterinarians do use some human medications to treat animals, it’s important to remember that not all drugs meant to treat people are safe for cats, and even the ones that are may only be safe at extremely controlled doses. Their safety may also be affected by individual patient concerns such as age and concurrent illness.

Even if a medication is not listed in this article, it is best to assume that all human medications are toxic to cats and avoid giving your cat anything without speaking to your veterinarian first.

Below are some of the most common human medications that can result in poisoning in cats:






Common Human Medications and Other Species Treatments Poisonous to Cats

Some Dog Flea Meds Are Toxic To Cats 

Cats and dogs have different physiologies and these products affect them differently. Canine formulations of flea and tick preventive

 products can be lethal  for cats, so you can not use the same medication on your dog as your cat — unless it has been specifically formulated for both species.  If in doubt, don’t do it.

PetMD has a lot of great information, but use at your own discretion.  If in doubt, don’t do it until you can be certain.


Both cats and dogs need to be given preventive products for fleas and ticks. If you are the head of a household where cats and dogs reside together, you may be tempted to get one flea and tick treatment for both. It’s important that you do your research carefully before using any product on your pets that has not been explicitly prescribed for them, and this is particularly the case with flea and tick treatments. Cats and dogs have different physiologies and these products affect them differently. Canine formulations of flea and tick preventive products can be lethal for cats, so you can not use the same medication on your dog as your cat — unless it has been specifically formulated for both species.

There are some products that come in both a cat and dog version, but you still need to read the labels carefully to make sure you are using a product that is labeled for use in cats before applying it on, or giving it to your cat. Cats can become very ill and even die from an incorrect application of dog flea and tick treatment. Link Here.

St. Louis 24hr Pet Emergency Hospital <–

ASPCA Animal Poison Control Center at (888) 426-4435

Another resource for information and treatment: Link

The 10 Most Common Poisons That Affect Cats


by Dr. Lorie Huston, DVM


What are the most common cat poisons—do you know? Back in 2006, an article published in Veterinary Medicine reported “The 10 most common toxicoses in cats” based on the 10 most common feline poisons reported to the American Society for the Prevention of Cruelty to Animals (ASPCA) Animal Poison Control Center.


The top poisons reported in this article included:



These are flea and tick products made specifically for dogs that were used mistakenly on cats.



Most of these products are relatively safe when used according to label directions but can be dangerous when directions are not followed carefully.



This is a prescription medication; an antidepressant used in people. The poison control center reports that cats readily consume this medication when given the opportunity. More