Cat Benadryl Dosage Calculator
Calculate safe dosage for your feline friend
Recommended Dosage
Important Safety Information
- Always consult your veterinarian before giving any medication to your cat
- Do not use Benadryl with certain health conditions or other medications
- Watch for side effects like drowsiness, dry mouth, or urinary retention
- Never use Benadryl products containing additional active ingredients
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How to Use the Cat Benadryl Dosage Calculator
Introduction to the Calculator
This Cat Benadryl Dosage Calculator helps pet owners determine a safe medication dosage for their feline companions. The tool follows veterinary guidelines to calculate proper Benadryl (diphenhydramine) amounts based on your cat's weight and the medication strength.
Step-by-Step Usage Instructions
1. Enter Your Cat's Weight
- Locate the "Cat's Weight" input field
- Enter your cat's weight as a number (e.g., 8.5)
- Use decimals for precise measurements (e.g., 4.2 for 4 pounds 3 ounces)
2. Select Weight Unit
- Choose between:
- Pounds (lbs) - Standard measurement in the US
- Kilograms (kg) - Metric system measurement
3. Select Benadryl Strength
- Choose from three common formulations:
- 12.5 mg/5 ml (Liquid Benadryl)
- 25 mg (Standard tablet/capsule)
- 50 mg (Extra strength tablet)
4. Calculate Dosage
- Click the "Calculate Dosage" button
- View your cat's personalized dosage recommendation
Understanding Your Results
The calculator provides:
- Recommended dosage in milligrams (mg)
- Equivalent liquid measurement (if liquid Benadryl was selected)
- Frequency guidelines (every 8-12 hours as needed)
Important Safety Information
Always remember:
- Consult your veterinarian before administering any medication
- Only use plain diphenhydramine without additional active ingredients
- Monitor for side effects like drowsiness or dry mouth
- Never exceed recommended dosages
Why This Calculator Is Veterinarian-Approved
Our tool uses the standard veterinary dosage formula of 1 mg per pound of body weight, ensuring accurate, safe recommendations for feline patients.

Frequently Asked Questions
Q: Can I give my cat Benadryl for allergies?
A: Yes, but only under veterinary supervision and with proper dosing.
Q: How often can I repeat the dosage?
A: Typically every 8-12 hours, but consult your vet for your cat's specific needs.
Q: What if my cat has side effects?
A: Discontinue use immediately and contact your veterinarian.