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The reversal of morphine tolerance was partially blocked by both the GABAA receptor blocker bicuculline and by the GABAB receptor blocker phaclofen and the administration of both inhibitors completely reversed the effects of ethanol on morphine tolerance .
 Chemical: morphine; Chemical: bicuculline; Chemical: phaclofen; Chemical: ethanol; Chemical: morphine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: morphine; Chemical: bicuculline; Chemical: phaclofen; Chemical: ethanol; Chemical: morphine