1841
He had used heroin since age 20 , and had used 150 mg methadone daily for 6 months .
 Chemical: heroin; Chemical: methadone
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: heroin; Chemical: methadone