Is Metronidazole (Flagyl) Safe for Cats?
Why it’s a problem
Metronidazole is used in feline medicine, but a cat’s small size means human tablets can approach or exceed toxic amounts. High exposure is neurotoxic and has caused wobbliness, tremors, and seizures in cats. Even smaller doses commonly cause drooling, vomiting, and food refusal.
How to keep your pet safe
Store Flagyl where a cat cannot pop tablets off a counter, and never self-dose a cat. If your vet prescribes metronidazole, follow the exact duration — overdosing accumulates risk.
Warning signs to watch for
Foamy drooling, vomiting, refusal to eat, hiding, low energy; overdose signs include wobbliness, tremors, rapid eye movements, and seizures.
When to call the vet
Call your veterinarian or a pet poison hotline with the estimated amount. Any tremor, stumbling, or seizure means an immediate visit.
Common questions
My cat ate one of my Flagyl tablets — how worried should I be?
One human tablet can be a significant dose for a small cat, so call your vet or a poison hotline now rather than waiting. Most exposures cause nausea, but overdose risk is real with this drug.
My cat is wobbling after swallowing metronidazole — what does that mean?
Wobbliness fits metronidazole neurotoxicity, which can progress to tremors and seizures. Your cat needs veterinary care right away.
Can I treat my cat’s diarrhea with my own metronidazole?
No. The causes of feline diarrhea vary, and this drug requires exact dosing. Wrong use risks neurologic side effects while the real problem continues.
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).