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Various reported side effects of fentanyl administration include chest wall rigidity , hypotension , respiratory depression , and bradycardia .
 fentanyl, chest wall rigidity, hypotension, respiratory depression, bradycardia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 fentanyl, chest wall rigidity, hypotension, respiratory depression, bradycardia