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Hypotension following the initiation of tizanidine in a patient treated with an angiotensin converting enzyme inhibitor for chronic hypertension .
 Hypotension, tizanidine, angiotensin, hypertension
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Hypotension, tizanidine, angiotensin, hypertension