3941
A mean overall dose of etomidate 17 . 4 microgram / kg / min . was required to maintain sleep , but great individual variation occurred , with older patients requiring less drug .
 Chemical: etomidate
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: etomidate