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My cat got expired Hartz dog flea medicine. What should I do?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 11.5 lbs

I accidentally gave both of my cats both weighing over 10 pounds Hartz Ultraguard pro half a tube meant for dogs weighing 61-150 pounds. The expiration date was March 2012. I can't find information on the shelf life. I was able to give one cat a dawn dish soap bath but I'm not able to get my other cat. Neither cat is showing symptoms of intoxication and has been over an hour. What should I do? Is there a way someone knows the shelf life and whether the drug is still active?

2 Answers

Most Helpful Answer

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Answered By Lauren Celestin, DVM

Veterinarian, Veterinary Dentistry Resident

Published on July 7th, 2017

Great job with the bath! If they are not showing any signs of illness (behavior changes, vomiting, diarrhea, etc) they are probably ok, especially the one that got the bath. Ideally if you can get the other cat and either bathe him or at the very least wipe him down with a wet washcloth. I would continue to monitor them for any signs and definitely if you notice any changes with them they should be seen by a vet immediately. Also, i think after 5 years the efficacy is greatly reduced, but the best place to get that information is by calling the Animal Poison Control Hotline.

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    Answered By Angel Alvarado, LVT

    Licensed Veterinary Technician

    Published on

    The ASPCA Animal Poison Control Center may have that information. You can call (888) 426-4435. There will be a fee for this call. You can try using food or treats to get the other cat. It is important to remove as much of the topical as possible to reduce risk of toxicity.

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