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Drug doses steered by a lab value

Doses for five drugs whose dose is set by a lab result: phenobarbital, potassium chloride, methimazole, trilostane and levothyroxine. Each page pairs the dose with the test that adjusts it.

By Vetinuity, founded by Brian Toncray, DVM, emergency veterinarian · October 26, 2026

• Phenobarbital Dose for Dogs and Cats, by Serum Level
• Potassium Chloride Supplementation Chart for Dogs and Cats
• Methimazole Dose for Cats, Adjusted by T4
• Trilostane Dose for Dogs, Monitored by Cortisol
• Levothyroxine Dose for Dogs and Cats, Post-Pill T4