4013
When single - dose haloperidol was given again 25 days later , greater impairment with earlier onset was noted in several tests in both treatment groups , suggesting enhancement of this effect .
 Chemical: haloperidol
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: haloperidol