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Before dobutamine was begun , no therapy was given during the first visit , and patients were randomized on subsequent visits to receive metoprolol or metoprolol plus glucagon 1 mg .
 Chemical: dobutamine; Chemical: metoprolol; Chemical: metoprolol
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: dobutamine; Chemical: metoprolol; Chemical: metoprolol