The 28-year-old patient checks himself into a center for detoxification from opiates, which he has used daily for 3 years. The patient begins to experience pain, diarrhea, salivation, and diaphoresis and is started on buprenorphine. Worsening pain throughout the body and uncontrollable diarrhea prompts stepwise increase of buprenorphine dose to the maximum dose without relief of withdrawal symptoms. The nurse contacts the provider to request an order for which medication?  

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