950
Conscious SHR were treated for 4 days with prazosin at 2 mg kg - 1 day - 1 i . p . for chronic alpha 1 - adrenoceptor blockade .
 Chemical: prazosin
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: prazosin