This Dog Benadryl Dosage Calculator helps dog owners determine a safe and effective dosage based on their dog’s weight. Benadryl (diphenhydramine) is an over-the-counter antihistamine that is often recommended by veterinarians for treating allergies, insect bites, and certain mild reactions in dogs. Always consult your veterinarian before administering any medication.

Input Fields

• Weight: Enter your dog’s weight.
• Weight Unit: Select either kilograms (kg) or pounds (lb).

Output

The calculator will provide:

• Dosage by Weight: {round(dose_mg, 1)} mg (based on 1 mg/lb or 2.2 mg/kg)
• Tablets: {tablets_needed} tablets (based on 25 mg per tablet)
• Liquid: {liquid_ml} ml (based on 12.5 mg per 5 ml formulation)

Dosage Calculation

The standard veterinary recommendation for Benadryl in dogs is 1 mg per pound of body weight (or approximately 2.2 mg per kilogram), administered 2-3 times daily depending on symptoms. The dosage is calculated as follows:

If weight is in lb:
    dosage = weight * 1 mg
If weight is in kg:
    dosage = weight * 2.2 mg

This dosage can then be converted to the number of tablets (25 mg each) or liquid volume (12.5 mg per 5 ml) to be administered.

Common Uses (Indications)

• Allergic reactions (seasonal, food-related, or environmental)
• Insect bites or stings
• Itching and hives
• Motion sickness
• Mild anxiety or sedative effect

Use with Caution

Benadryl should be used cautiously or avoided in the following situations:

• Dogs with glaucoma
• Dogs with high blood pressure or cardiovascular disease
• Dogs with urinary retention issues
• Pregnant or lactating dogs
• Dogs on other medications that may interact with antihistamines

When to Contact a Veterinarian

You should consult a veterinarian before giving Benadryl if:

• You are unsure about your dog’s medical history
• Symptoms are severe or persistent
• Your dog is under 12 weeks old
• You’re dealing with bee stings, facial swelling, or breathing difficulty
• There are any signs of overdose, such as tremors, rapid heartbeat, or seizures

Note: This calculator is intended as a general guideline only. Always follow your veterinarian’s advice for dosage and frequency.