Can I Give My Cat Benadryl?
Skip it or ask a vet first if
Published range by weight
| Weight | Diphenhydramine (published range) |
|---|---|
| 8 lb cat | 3.6-7.3 mg |
| 10 lb cat | 4.5-9.1 mg |
| 14 lb cat | 6.3-13 mg |
Computed from the published 1-2 mg/kg reference range, every 8-12h. Product strengths rarely split evenly, so round DOWN to the nearest practical dose and confirm with your vet.
Dogs use a different amount
The published dog reference (1 mg per lb (2.2 mg/kg)) differs from the cat range. Never split the difference between species; check the dog page instead.
About Diphenhydramine
Diphenhydramine is an antihistamine, a class used to blunt allergic responses like itching, hives, and insect-sting swelling. You will see it sold as Benadryl, and the label strength on the box is what matters for the math, not the brand. Reference data on this page reflects published veterinary sources, not a prescription for your cat.
What to have ready when you call the vet
Whether you are confirming a dose or reporting that your cat already got into something, the call goes faster with four facts ready: your cat's current weight, the exact product name and strength from the label, how much was given or eaten, and roughly when. With those, most clinics can answer in one call.
The safe habit
Confirm any medication decision with your veterinarian, who knows your cat's health history and other medications. VetDose shows published reference data, not prescriptions.