異丙托溴銨
局部給藥（吸入）的異丙托溴銨是一種抗毒蕈鹼藥物，用於支氣管痙攣疾病的輔助治療，例如馬的復發性呼吸道阻塞（RAO）和小動物的慢性呼吸道疾病。 **臨床要點：** * 異丙托溴銨是阿托品（Atropine）的四級銨衍生物。由於其高極性，它很難被吸收到全身血液循環中，也不易穿過血腦屏障，從而顯著降低了全身性抗膽鹼副作用的風險。 * 其作用時間相對較短，可能需要頻繁給藥。 * 雖然小動物的正式藥代動力學數據有限，但作為輔助支氣管擴張劑，它通常被認為是安全且有效的。
作用機制: Ipratropium acts as a competitive antagonist of **acetylcholine** at muscarinic receptors in the bronchial smooth muscle. * **Mechanism:** Antagonizes acetylcholine → Prevents increases in intracellular **cyclic guanosine monophosphate (cGMP)** → Reduces bronchial smooth muscle constriction. * **Advantage over Atropine:** Unlike atropine, ipratropium **does not reduce mucociliary clearance**, making it highly beneficial for patients with respiratory diseases where clearing airway secretions is critical.
各物種劑量
- Adjunctive treatment of RAO, heaves (mild to moderate disease) · 180 micrograms inhaled aerosol · Inhalation · q4-6h · 14 days
- Adjunctive treatment of RAO/heaves (moderate to severe disease) · 90-180 micrograms inhaled via Equine Aeromask or Equine Haler · Inhalation · every 6 hours
- Adjunctive treatment of foals with severe bronchospasm · 2-3 micrograms/kg via aerosol · Inhalation · q6-8h
- As a bronchodilator in rats · one puff into nebulization chamber · Inhalation · twice daily
劑量為持牌獸醫專業人員的臨床參考。請務必對照最新藥品說明書及個別病患確認。
給藥途徑
禁忌症
- Hypersensitivity to ipratropium or other atropine derivatives
不良反應
- Tracheal or bronchial irritation (coughing)
- Allergic responses
- Mild anticholinergic effects (e.g., dry mouth, tachycardia) in rare cases
藥物相互作用
- Anticholinergic drugs · May cause additive antimuscarinic effects
- Beta-adrenergic agonists (e.g., albuterol) · May have additive therapeutic bronchodilatory effects
監測
- Clinical efficacy (improvement in respiratory rate, effort, and lung sounds)
過量
Overdosage is unlikely to be a cause for concern. The drug is not well absorbed orally or after inhalation. Oral LD50 values for laboratory animals were greater than 1 gram/kg.
VetSheet 藥物參考供持牌獸醫專業人員作臨床決策輔助之用,不能取代專業判斷或廠方最新藥品說明書。