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In a double - blind 6 - week trial , 458 patients with acute schizophrenia were randomly assigned to fixed - dose treatment with asenapine at 5 mg twice daily ( BID ) , asenapine at 10 mg BID , placebo , or haloperidol at 4 mg BID ( to verify assay sensitivity ) .
 schizophrenia, asenapine, asenapine, haloperidol
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 schizophrenia, asenapine, asenapine, haloperidol