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The search for non-narcotic drugs that will enhance the analgesic effects of opiates without enhancing their side effects has included the investigation of psychoactive drugs already approved for other uses. Some research has supported an analgesic effect of risperidone (RIS), an atypical neuroleptic. However, the analysis of the analgesic efficacy of RIS alone or as an adjuvant to morphine (MOR)...
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