Is Cats Safe?
Is Ivermectin / OTC Dewormers Safe for Cats?
Caution — Ivermectin / OTC Dewormers can be risky for cats.
Ivermectin / OTC Dewormers isn't classed as outright toxic, but it warrants caution around cats — Safe at FDA-approved feline doses, but concentrated equine/bovine pastes overdose easily, and cats with the MDR1 (ABCB1) gene mutation can be poisoned at normal doses. (Separately, NEVER use a dog flea spot-on — see Permethrin.). When in doubt, keep it out of reach and ask your veterinarian.
| Category | Medicine |
|---|---|
| Also known as | ivermectin, dewormer, wormer, macrocyclic lactone |
Signs to watch for in cats
Overdose: wobbliness, dilated pupils, blindness, tremors, drooling, coma. Use only FDA-approved feline products as directed; overdose is an emergency.
If your cat may have been exposed to Ivermectin / OTC Dewormers:
- Don't wait for symptoms; don't induce vomiting unless a professional tells you to.
- Note what and how much, and take any packaging with you.
- Call your vet or a 24/7 line now — Pet Poison Helpline 855-764-7661 · ASPCA 888-426-4435.
Cat-safe alternatives
Browse all Medicine for cats · or check another item.
Source: VCA Hospitals; Merck Vet Manual; Pet Poison Helpline ↗
Frequently asked questions
Is Ivermectin / OTC Dewormers safe for cats?
Ivermectin / OTC Dewormers is best treated with caution — it isn't classed as toxic but can cause problems for cats in some forms or amounts.
What are the symptoms if a cat is exposed to Ivermectin / OTC Dewormers?
Reported signs include: Overdose: wobbliness, dilated pupils, blindness, tremors, drooling, coma. Use only FDA-approved feline products as directed; overdose is an emergency.
What should I do if my cat ate Ivermectin / OTC Dewormers?
Contact your vet or a 24/7 animal poison line right away: Pet Poison Helpline (855-764-7661) or ASPCA Animal Poison Control (888-426-4435).