Which medication among the following is NOT typically used for opioid use disorder?

Fentanyl is not typically used for opioid use disorder because it is itself a potent opioid that can lead to increased dependency and overdose risks. Instead of treating opioid use disorder, fentanyl is primarily prescribed for pain management due to its strong analgesic properties. In contrast, medications like methadone and buprenorphine are specifically designed for the treatment of opioid use disorder by helping to alleviate withdrawal symptoms and reduce cravings. Naltrexone is also used in the context of this disorder as it blocks the effects of opioids, thus preventing relapse. Therefore, the focused role of fentanyl as a high-potency opioid in pain management, rather than in the treatment of addiction, makes it the correct choice in this context.