A 22-year-old woman is brought to the Emergency Department by her boyfriend, who says that she is experiencing a fentanyl overdose. She is unresponsive and cyanotic. She regains consciousness after naloxone is injected intravenously and demonstrates no further respiratory depression during 8 hours of observation. She states that she is 22 weeks' pregnant and wants to stop using opioids. Which one of the following is the best next step?
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