4026
In order that this syndrome might be investigated changes in mental status ( M . S . ) were correlated with serum concentrations and renal and hepatic function in 36 patients , 30 patients had no M . S . change on cimetidine and 6 had moderate to severe changes .
 cimetidine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 cimetidine