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The pharmacokinetic characteristics of the optimized risperidone patch were determined using rabbits , while orally administered risperidone in solution was used for comparison .
 Chemical: risperidone; Chemical: risperidone
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: risperidone; Chemical: risperidone