20028
In experiment 3 , the co - administration of 20 mg / kg bupropion and naltrexone ( 0 . 1 and 1 . 0 mg / kg ) not only produced an additive anorectic profile ( including a reduced rate of eating ) , but the addition of the opioid receptor antagonist also concurrently attenuated the psychomotor stimulant response to the atypical antidepressant .
 Chemical: bupropion; Chemical: naltrexone
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: bupropion; Chemical: naltrexone