4345
Based on these observations , it is concluded that 5 - HT2 blockade obtained with risperidone at D2 occupancy rates of 60 % and above does not appear to protect against the risk for extrapyramidal side effects .
 risperidone
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 risperidone