Is Amoxicillin Safe for Cats?
Why it’s a problem
Amoxicillin is not among the most dangerous human drugs for cats, but an unsupervised dose can cause vomiting, drooling, and refusal to eat. Cats hide illness well, so loss of appetite may be the first visible sign. Repeated exposure or a large ingestion raises the risk of more serious GI problems.
How to keep your pet safe
Store human antibiotics where a curious cat cannot knock the bottle down and chew it, and never give a cat leftover pills. Cats need vet-prescribed antibiotics at cat-appropriate doses.
Warning signs to watch for
Drooling, vomiting, diarrhea, refusal to eat, hiding, low energy; a large ingestion can cause dehydration and more severe GI upset.
When to call the vet
Call your veterinarian or a pet poison hotline with your best estimate of the amount eaten. If your cat stops eating for more than a day, that alone warrants an exam.
Common questions
My cat ate one amoxicillin capsule — is this dangerous?
One capsule is more likely to cause drooling and an upset stomach than a crisis in a healthy cat, but it should still be reported. Call your vet or a poison hotline for advice tailored to your cat’s size.
My cat will not eat after swallowing my antibiotic — what now?
Loss of appetite in cats can escalate quickly, so contact your veterinarian. Cats that go without food for even a couple of days can develop secondary liver problems.
Can I treat my cat’s infection with my own amoxicillin?
No. Cat infections need the right drug and dose chosen by a vet, and human leftovers may be the wrong choice entirely or dosed dangerously.
More medications hazards for cats
This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate or touched something concerning, contact your veterinarian or a pet poison hotline right away. In the US: Pet Poison Helpline (855) 764-7661, ASPCA Animal Poison Control (888) 426-4435 (fees may apply).