Is Azithromycin (Zithromax) Safe for Cats?
Why it’s a problem
Cats sometimes receive veterinary azithromycin, so the drug itself is not foreign to their system, but human tablets and concentrated suspensions can cause vomiting, drooling, and food refusal. A cat that stops eating for more than a day can slide into secondary illness. The long half-life of this antibiotic means effects can persist.
How to keep your pet safe
Store suspension bottles and blister packs away from cats, and never give leftover antibiotics to a cat. Feline infections require a vet’s diagnosis and prescription.
Warning signs to watch for
Drooling, vomiting, diarrhea, refusal to eat, hiding, low energy; a large volume of liquid may cause worse GI upset.
When to call the vet
Call your veterinarian or a pet poison hotline with the form and estimated amount. Arrange an exam if your cat refuses food for more than a day.
Common questions
My cat licked my azithromycin suspension — is that bad?
A lick is likely to cause little more than drooling, but the concentrated liquid packs a lot of drug per milliliter. Call your vet or a poison hotline and describe the amount.
My cat vomited twice after eating my Zithromax tablet — now what?
Report it to your veterinarian, keep water available, and watch whether your cat eats afterward. Repeated vomiting or food refusal for a day or more needs an exam.
Can I use my azithromycin for my cat’s eye infection?
No. Eye infections need specific diagnosis and treatment, and self-dosing with human antibiotics can delay proper care. See your vet.
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).