The Phenobarbital Dosage Calculator for Dogs is a veterinary tool designed to help calculate safe and effective dosage of phenobarbital for the management of canine epilepsy and seizure disorders. Phenobarbital is one of the most commonly prescribed anti-convulsant medications in veterinary neurology, and it is vital to use the correct dosage to ensure both therapeutic efficacy and safety.

Input Parameters

• Dog’s Body Weight (in kilograms): This value is used to calculate the appropriate drug dosage.

Output

• Recommended Initial Dosage (mg): Based on standard dosing guidelines of 2.5–5 mg/kg administered twice daily (q12h).
• Dosage Range: The minimum and maximum safe starting dose range based on body weight.

How to Use This Calculator

1. Weigh your dog in kilograms. If you only know the weight in pounds, divide by 2.2 to convert to kg.
2. Enter the weight into the calculator.
3. The calculator will return a dosing range based on:
   • Minimum dose: 2.5 mg/kg
   • Maximum dose: 5.0 mg/kg
   Both values are calculated per administration, typically given every 12 hours.
4. Use this information as a starting guideline and consult your veterinarian for personalized dosing and monitoring.

Calculation Method

The standard initial dosing protocol for phenobarbital in dogs is:

• 2.5 to 5.0 mg per kg of body weight, administered every 12 hours (q12h).

Calculation formula:

Dose (mg) = Weight (kg) × Dose Rate (mg/kg)

Clinical Considerations & Safety

Phenobarbital is a controlled substance and requires long-term blood level monitoring. Overdosing or improper use may lead to side effects such as sedation, ataxia, liver toxicity, increased thirst and urination, and tolerance over time. Dogs on phenobarbital should have routine bloodwork to monitor liver function and drug serum concentration levels. Never adjust dosage without veterinary guidance.

This calculator provides only an estimated dosage range and is not a substitute for individualized treatment plans developed by licensed veterinarians. Always seek professional advice before beginning or modifying any anticonvulsant therapy.