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Cimetidine , a histamine 2 ( H2 ) antagonist , produces a decrease in arterial pressure due to vasodilatation , especially in critically ill patients .
 Chemical: Cimetidine; Chemical: histamine
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: Cimetidine; Chemical: histamine