商品名：Trexan, Vivitrol
Opiate antagonist. Naltrexone competes for opiate receptors and displaces opioid drugs from these receptors, thus reversing their effects. It is capable of antagonizing all opiate receptors. Its action is similar to naloxone except that it is longer-acting and administered orally. A related drug that does not have central-acting effects is methylnaltrexone (used to treat intestinal ileus). For humans, there is a long-acting injection formulated in microspheres that persists for 1 month after a single injection. The long-acting form has not been used in animals.
Naltrexone is used in people for treatment of opiate dependence and alcoholism. In animals some obsessive-compulsive disorders are believed to be mediated by 534 Naltrexone endogenous opioids. It has been used successfully for treatment of some obsessive-compulsive behavioral disorders, such as tail chasing in dogs, acral lick granuloma in dogs, and crib biting in horses. The effect for each of these disorders is short-lived.
劑量數字暫停提供：VetPro 的劑量改依 DRUGAPI 藥物資料庫對外的內容，DRUGAPI 目前不提供可直接計算的劑量。下方列出 DRUGAPI 的審查結論與劑量審查引用的來源；計算機可手動輸入劑量換算。
納曲酮必須以精確藥物型態、產品、法規身分、物種、目標類鴉片藥物、適應症、途徑與研究協定判讀；通用執行值維持關閉。
DRUGAPI 劑量審查引用的獸醫官方標示（各標示只適用於其產品、物種與法域，不可互換）
renal