Naltrexone Dosage Calculator

Naltrexone Dosage for Dogs and Horses By Weight
Trade Names: Trexan, Vivitrol, Opioid antagonist
Functional classification: Opioid Antagonist

Naltrexone Dosing for Dogs and Horses By Weight

Important Safety Information

For horses: Injectable formulations are not available commercially and must be compounded for IV or SQ administration.

Duration of effect for crib biting in horses is 1-7 hours.

Reference Source

Saunders Handbook of VETERINARY DRUGS, Page 580-581

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Standard Dosage Guidelines

Small Animal Dosage

Species Route Dosage Frequency
Dogs PO 2.2 mg/kg Every 12 hours

Large Animal Dosage

Species Route Dosage Frequency
Horses IV, SQ 0.04 mg/kg Single dose
IV, SQ 100 mg/animal For reversal of opiates

Indications

Dogs: For behavior problems

Horses: Crib biting, reversal of opiates