In contrast, a physician with a DEA X number can write a prescription for buprenorphine and have a patient fill it at a pharmacy. There is inherently less structure surrounding buprenorphine therapy than that of methadone, Dr. Grossman noted. There are no hard and fast rules about how often a physician has to see the patient or do drug screens or counseling. Buprenorphine is available as once-daily oral sublingual therapy and, more recently, in long-acting injectable and implantable formulations, although Dr. Grossman believes the jury is still out about how these nonoral agents are best utilized.
“I’m often asked, ‘Which is better, methadone or buprenorphine?’ Really, the answer is they’re both pretty darn good,” according to Dr. Grossman.
The Cochrane review concluded that, in the studies that have used real-world dosing – that is, higher doses than in the initial studies – high-dose buprenorphine and high-dose methadone have similar rates of retention in treatment.
“What I tell patients is that a lot hinges on the structure of the treatment delivery system,” Dr. Grossman said. “If it’s methadone, they’re going to the OTP every day. Some people need more structure; they need a set of eyes on them every day. Or if they are at high risk for medication diversion – for example, someone else in their household might want to steal their medications – going to a methadone program gets around that. Also, when somebody has been on methadone in the past and did well on it and wants to go on it again, I’m likely to say, ‘That sounds like a good fit.’”
Buprenorphine is a good option for patients who don’t require close, structured supervision. It has fewer drug interactions than does methadone and is less prone to cause QTc prolongation. Also, it’s a more realistic option for patients who live so far from an OTP that daily attendance is impractical. And ob.gyns increasingly favor buprenorphine, because the problem of neonatal abstinence syndrome is less severe than when mothers are on methadone.
As for extended-release naltrexone (Vivitrol), the pivotal double-blind Russian trial that won FDA approval for treatment of OUD showed a dramatic improvement in opioid-free weeks (Lancet. 2011 Apr 30;377[9776]:1506-13).
More recently, the 24-week, multicenter, open-label X:BOT trial randomized 570 U.S. patients with OUD to once-monthly extended-release naltrexone or daily sublingual buprenorphine-naloxone (Suboxone). The dropout rate was higher in the extended-release naltrexone arm because patients had to be opioid free for 2 weeks before starting on the opioid antagonist. As a practical matter, that can be difficult to achieve unless a patient has just been released from jail or prison. But the per-protocol relapse rates were similar (Lancet. 2018 Jan 27;391[10118]:309-18).
“Many people interpret this study as saying, with the right patient who can get into an opioid-free state or, if you inherit an opioid-free state, the choice between extended-release naltrexone and buprenorphine-naloxone may be a bit of a wash in terms of clinical effectiveness, as best we can detect,” Dr. Grossman explained. “That said, they’re very different experiences: One is a shot in your butt once a month, the other is something you put in your mouth once a day. Patients typically have a strong point of view regarding what they’re up for.”
Extended-release naltrexone doesn’t require a DEA waiver or attendance at an OTP. But it costs roughly $800 per injection, although many insurers do cover it after additional paperwork is completed. While Dr. Grossman does use extended-release naltrexone in her own practice, it comes with some baggage. The drug comes in a powder, which is mixed with a diluent in the office, creating a thick, frothy substance that’s slow to inject. It has to be kept refrigerated, then warmed up in time for the patient visit.
“If you live somewhere where there’s no OTP and you don’t have a DEA X number, and you have a patient with OUD who’s interested in extended-release naltrexone, it’s not crazy to think about,” she noted.
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