3657
Intramedullary administration of clonidine , but not saline vehicle , caused a dose - dependent decrease in both the mean arterial pressure and the heart rate .
 Chemical: clonidine
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: clonidine