Cat Benadryl Dosage Calculator (Diphenhydramine)

Your details

Enter your cat's current body weight. Use ideal body weight if your cat is significantly overweight.
lb
Choose the Benadryl product you have on hand. Always use plain diphenhydramine HCl with no other active ingredients.
DoseWithin safe range
10mg

Diphenhydramine dose at 1 mg per lb of body weight

Liquid (12.5 mg / 5 mL)4mL
25 mg tablet1/2 tablet
12.5 mg chewable tabletAbout 3/4 tablet
Max doses per day3
Max daily total30mg
10 mg
Very small cat<5Average cat5-15Large cat15-25Confirm with vet25+

Dose: 10.0 mg of diphenhydramine, up to 3 times per day.

  • At 1 mg per pound, your 10 lb cat needs 10.0 mg of diphenhydramine per dose.
  • Children's liquid Benadryl (12.5 mg per 5 mL) is the easiest way to measure small doses accurately - give 4.0 mL per dose.
  • Never use Benadryl products that contain other active ingredients such as pseudoephedrine, acetaminophen, or alcohol - only plain diphenhydramine HCl is safe for cats.

Next stepBenadryl treats symptoms (itching, mild allergic reactions, motion sickness) but does not address the underlying cause. Contact your vet if symptoms are severe, worsen, or do not improve within 24 hours.

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