Etorphine is a hugely potent opioid that is a component of large animal and small animal immobilon. (Large animal immobilon consists of etorphine plus [[Phenothiazines#Acepromazine|acepromazine]]; small animal immobilon comprises etorphine and [[Phenothiazines#Methotrimeprazine|methotrimeprazine]] ). It may be fatal to man following self administration, when opioid antagonism with [[#Opioid Antagonists|naloxone]] is required. | Etorphine is a hugely potent opioid that is a component of large animal and small animal immobilon. (Large animal immobilon consists of etorphine plus [[Phenothiazines#Acepromazine|acepromazine]]; small animal immobilon comprises etorphine and [[Phenothiazines#Methotrimeprazine|methotrimeprazine]] ). It may be fatal to man following self administration, when opioid antagonism with [[#Opioid Antagonists|naloxone]] is required. |