Laura is a 24 year-old female who came to the emergency room this evening with severe nausea, vomiting, diarrhea, tremors, hot and cold flushes, sweating, and goosebumps. In the physical examination, you found an anxious, watery eyed patient, who was yawning and restless. She reports that she has been using oxycodone, methadone regularly and marijuana occasionally. Last night she had two beers, her regular daily intake. Today she went to an outpatient clinic for the treatment of her opioid disorder and was started on naloxone 50 mg once daily. Which of the following medications is the reason for her emergency room visit this evening?
