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We investigated the safety and efficacy of adding different doses of ephedrine to propofol in order to obtund the hypotensive response .
 ephedrine, propofol, hypotensive
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 ephedrine, propofol, hypotensive