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This study was conducted to examine whether prolonged pretreatment with isoproterenol could abolish bromocriptine - induced tachycardia in conscious rats .
 isoproterenol, bromocriptine, tachycardia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 isoproterenol, bromocriptine, tachycardia