2670
Design and analysis of the HYPREN - trial : safety of enalapril and prazosin in the initial treatment phase of patients with congestive heart failure .
 enalapril, prazosin, congestive heart failure
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 enalapril, prazosin, congestive heart failure