亮丙瑞林 (Leuprolide)
**亮丙瑞林 (Leuprolide)** 是一種促性腺激素釋放激素 (GnRH) 的合成九肽類似物。在獸醫學中，主要用於內科治療**雪貂的腎上腺相關內分泌病**，以及抑制**圈養鳥類的不當產卵或繁殖障礙**。 主要臨床重點： * **雪貂腎上腺疾病**：與狗不同，雪貂的腎上腺疾病是由過量的性荷爾蒙（雄性激素/雌性激素）驅動，而非皮質醇。亮丙瑞林能有效抑制導致這些臨床症狀（如脫毛、外陰腫脹、搔癢）的荷爾蒙軸。 * **劑型**：最常以長效**儲庫型注射劑**（微球體）給藥，可提供 1、3 或 4 個月的持續釋放。 * **成本**：此藥物極為昂貴，不過調劑藥局通常會將人類用藥瓶分裝成較小、較經濟的等份供特寵使用。 * **安全性**：具有高度致畸胎性，懷孕期間絕對禁用。
作用機制: Leuprolide acts as a **luteinizing hormone-releasing hormone (LHRH/GnRH) agonist**. * **Initial Phase (Flare)**: Upon initial administration, it stimulates the pituitary gland, causing a transient surge in **luteinizing hormone (LH)** and **follicle-stimulating hormone (FSH)**. * **Downregulation Phase**: Continuous exposure via depot formulation causes profound downregulation and desensitization of **GnRH receptors** in the anterior pituitary. * **Suppression**: This negative feedback → halts the release of **LH** and **FSH** → drastically decreases serum levels of gonadal steroids (**estrogen** and **androgens**), thereby resolving hormonally driven clinical signs.
各物種劑量
- Adrenal associated endocrinopathy (30-day formulation) · 100 micrograms/kg (females) or 200 micrograms/kg (males) · IM · q30d · Lifelong/Ongoing · Proven effective for management of the disease.
- Adrenal associated endocrinopathy (3-month formulation) · 1 mg (total dose) · IM · every 60-75 days · Lifelong/Ongoing · Length of control in intact ferrets in Spring; may be useful for annual Dec/Feb suppression.
- Adrenal associated endocrinopathy (4-month formulation) · 2 mg (total dose) · IM · every 70-80 days · Lifelong/Ongoing · Anecdotal time before signs reappear; may be useful for annual Dec/Feb suppression.
- Adrenal associated endocrinopathy (30-day formulation, weight-based) · <1 kg: 100 micrograms; >1 kg: 200 micrograms · IM · q30d · Lifelong/Ongoing · Generally diluted from original concentration to negate muscle necrosis. Diluted form appears active after freezing for a year (though manufacturer advises against freezing).
- Adrenal associated endocrinopathy (1-month depot form) · 100-250 micrograms/kg · IM · every 4 weeks until signs resolve, then every 4-8 weeks as needed · Lifelong · Larger ferrets may require the higher dosage range.
- Inappropriate egg laying in Cockatiels (if management changes fail) · 800 micrograms/kg IM every 2 weeks for 3 injections · IM · q14d · 3 injections · Often effective at reducing reproduction at least in the short-term.
- Inhibit egg laying in pet birds · 100 micrograms/kg per day. Multiply dose by number of days for effect and give once monthly (e.g., 100 mcg/kg x 28 days = 2800 mcg/kg dose) · IM · q30d · Monthly
給藥途徑
禁忌症
- Pregnancy (FDA Category X - major fetal abnormalities may result)
- Nursing/lactating animals (use with extreme caution, excretion in milk is unknown)
不良反應
- Pain or irritation at the injection site
- Dyspnea (reported in ferrets)
- Lethargy (reported in ferrets)
- Tachyphylaxis (higher dosages required over time to obtain the same effect in ferrets)
- Transient worsening of clinical signs (flare effect) shortly after initial administration
監測
- Ferrets: Resolution of clinical signs (decreased vulvar swelling, reduced pruritus, cessation of undesirable sexual behaviors/aggression, and increased hair regrowth)
- Birds: Decreased egg-laying behavior and physical reproductive activity
- Injection site for signs of pain, irritation, or necrosis
過量
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.
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