Cat Benadryl Dosage Calculator

How to Calculate Cat Benadryl Dosage

This calculator determines a safe Benadryl (diphenhydramine) dose for cats based on weight, using these formulas:

Dose per Administration (mg):

\[ \text{Dose (mg)} = \text{Weight (lb)} \times 1 \]

Tablets (25 mg): Divide mg by 25, round to nearest 0.25 tablet (quarter).

Volume (mL, Liquid):

\[ \text{Volume (mL)} = \frac{\text{Dose (mg)}}{\text{Strength (mg/mL)}} \]

Where:

\( \text{Weight} \): Cat’s weight in pounds (lb) or kilograms (kg, converted to lb)
\( \text{Strength} \): Tablet size (mg) or liquid concentration (mg/5 mL, e.g., 12.5 mg/5 mL = 2.5 mg/mL)

Dose is given every 8-12 hours, up to 3 times daily. Use plain diphenhydramine only, avoiding gel capsules or additional ingredients.

Using the Cat Benadryl Dosage Calculator

This tool estimates a Benadryl dose for cats to relieve allergies, motion sickness, or mild anxiety. Input the cat’s weight (lb or kg), select the form and strength (tablet or liquid), and results show the dose in mg, tablets (with quarters), or mL, with a frequency of every 8-12 hours.

Example: 7 lb cat, Liquid (12.5 mg/5 mL):

Every 8-12 hours (up to 3 times daily):
Amount per dose:
In milligrams: 7.0 mg
In Liquid (12.5 mg/5 mL): 2.8 mL
Dosing rules: 1 mg/lb (2.2 mg/kg) per dose

Consult a veterinarian before administering to ensure it’s safe for your cat.

Frequently Asked Questions (FAQ)

1. What is Benadryl used for in cats?

Benadryl (diphenhydramine) is an antihistamine used to relieve allergy symptoms (e.g., itching, swelling), motion sickness, or mild anxiety in cats, often for insect bites, vaccine reactions, or environmental allergies.

2. How often can I give my cat Benadryl?

It’s typically given every 8-12 hours, up to 3 times daily, but consult your vet for the appropriate frequency based on your cat’s condition.

3. Can I use human Benadryl for my cat?

Yes, if prescribed by a vet, but ensure it’s plain diphenhydramine (e.g., no decongestants, pain relievers, or alcohol) and avoid gel capsules or extended-release forms.

4. What’s the difference between tablets and liquid Benadryl?

Tablets (25 mg) are solid, easier for larger cats, while liquid (12.5 mg/5 mL or 25 mg/5 mL) allows precise dosing for smaller cats or those unable to swallow pills.

5. How do I adjust if my liquid strength differs?

Divide the mg dose by your liquid’s mg/mL concentration (e.g., for 12.5 mg/5 mL = 2.5 mg/mL, 7 mg = 2.8 mL).

6. Are there side effects I should watch for?

Common side effects include drowsiness or, rarely, excitement. If your cat shows severe symptoms like vomiting, difficulty breathing, or seizures, stop use and consult a vet immediately.