🐾 PawSafe Check

Is Benadryl (diphenhydramine) Toxic to Cats?

Yes — benadryl (diphenhydramine) is mildly toxic to cats.

Mildly toxic

PawSafe Check is for general information only and is not veterinary advice. Always contact your veterinarian or a poison control service if you think your pet has been exposed.

Symptoms to watch for

Toxic parts

Tablets, liquids, combo products

Toxic compound

Diphenhydramine

What to do now

  1. Remove any plant material from your cat's mouth and keep it out of reach.
  2. Gently rinse the mouth and offer fresh water.
  3. Call your vet if symptoms persist, get worse, or your cat is small, young or elderly.

Good to know

Vets sometimes recommend diphenhydramine at specific doses, but overdoses cause agitation or sedation and a fast heart rate. Some products also contain decongestants, which are dangerous.

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Frequently asked questions

Is benadryl (diphenhydramine) toxic to cats?

Yes — benadryl (diphenhydramine) is mildly toxic to cats. Vets sometimes recommend diphenhydramine at specific doses, but overdoses cause agitation or sedation and a fast heart rate. Some products also contain decongestants, which are dangerous.

What are the symptoms of benadryl (diphenhydramine) poisoning in cats?

Sedation or agitation. Dry mouth. Fast heart rate. Vomiting.

What should I do if my cat ate benadryl (diphenhydramine)?

Remove any plant material from your cat's mouth and keep it out of reach. Gently rinse the mouth and offer fresh water. Call your vet if symptoms persist, get worse, or your cat is small, young or elderly.

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