A nurse is caring for a client who has a new prescription for buprenorphine for opioid use disorder. Which of the following instructions should the nurse include?

The correct answer is B: Monitor for respiratory depression. This is crucial as buprenorphine can cause respiratory depression, especially when combined with other central nervous system depressants. Monitoring for signs such as slow or shallow breathing is essential for the client's safety. Choice A is incorrect as buprenorphine should be taken regularly, not just during withdrawal. Choice C is incorrect as weight gain is not a common side effect of buprenorphine. Choice D is incorrect as buprenorphine should be stored properly according to specific instructions, not just at room temperature.