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Question:

How much cephalexin is dangerous for a cat?

I'm really freaking out right now and could use some advice. Earlier today, I accidentally left a bottle of cephalexin on the counter, and my cat Felix managed to knock it over and scatter some pills. I'm not 100% sure how many he might have ingested, but I found some chewed up ones on the floor. Felix doesn't seem to be acting any different yet, but I'm terrified he could have taken a dangerous amount. I know cephalexin is sometimes prescribed to cats, but I have no idea about the dosage or at what point it becomes toxic. It's late here, and my vet isn't open until tomorrow. Does anyone have any experience with this sort of thing or advice on what I should do right now? I’m just so worried about my little guy. Thanks in advance for any help you can provide.

Answer:

Hello! I'm glad you reached out with your concern about cephalexin and your cat. Cephalexin is an antibiotic often used in both humans and animals to treat bacterial infections. However, dosing for cats is very specific and must be prescribed by a veterinarian based on your cat’s weight and health needs.



Giving too much cephalexin can lead to potential side effects such as gastrointestinal upset, including vomiting and diarrhea, or even more serious reactions like kidney damage. It's crucial never to administer human doses to your cat, as their metabolism and tolerance are quite different from ours.



If you suspect your cat has ingested more cephalexin than recommended, monitor them closely. Look out for warning signs such as severe lethargy, loss of appetite, changes in urination patterns, or any signs of an allergic reaction, like swelling or difficulty breathing.



In the meantime, ensure your cat stays hydrated, which can help support their kidneys, and keep them inside to observe their condition closely.



It’s always best to consult with a veterinarian if you’re concerned that your cat might have had too much medication. You can easily book a video consult with a vet through Dial A Vet to get more personalized advice and next steps. Stay calm, and let's make sure your furry friend gets the care they need.

Answered by

Louise - Senior Veterinary Nurse, Dial A Vet

June 22, 2025

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The "Ask a Vet" forum on Dial A Vet offers general information and helpful tips on pet health, but it's not a substitute for professional veterinary care. The advice here doesn't create a veterinarian-client-patient relationship, and our vets can't diagnose or treat your pet remotely. For emergencies or specific medical concerns, always contact your local veterinarian immediately. Your pet's health is unique, and decisions should only be made after consulting with a qualified professional. By using this forum, you acknowledge these limitations and agree to seek in-person veterinary advice for all your pet's health needs. View our content guidelines.
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