Leuprolide

Leuprolide is a synthetic nonapeptide analog of gonadotropin-releasing hormone (GnRH). In veterinary medicine, it is primarily utilized for the medical management of adrenal-associated endocrinopathy in ferrets and to suppress inappropriate egg-laying or reproductive disorders in captive birds.

Key clinical points:

• Ferret Adrenal Disease: Unlike dogs, ferret adrenal disease is driven by excess sex hormones (androgens/estrogens) rather than cortisol. Leuprolide effectively suppresses the hormonal axis responsible for these clinical signs (e.g., alopecia, vulvar swelling, pruritus).
• Formulations: It is most commonly administered as a long-acting depot injection (microspheres) that provides sustained release over 1, 3, or 4 months.
• Cost: The medication is extremely expensive, though compounding pharmacies often divide human vials into smaller, more affordable aliquots for exotic animal use.
• Safety: It is highly teratogenic and strictly contraindicated in pregnancy.

Because of its high expense and the method of dosing (usually administered by the veterinarian in-clinic), an acute overdose is highly unlikely. Studies in laboratory animals at massive dosages of up to 5 grams/kg IM produced no untoward effects, suggesting a wide margin of safety for acute exposure.

The standard injection should be stored below room temperature (<78°F); do not freeze and protect from light. The depot form may be stored at room temperature. After reconstituting, the suspension is stable for 24 hours, but immediate use is recommended as it contains no preservatives. Freezing the depot form is controversial; the manufacturer advises against it as it may destroy the microspheres.