Buprenorphine for the treatment of opioid-use disorder (OUD) may also mitigate the risk associated with concomitant benzodiazepine and Z-drug use, which is frequent in this patient population, new research suggests.
A case-crossover study of more than 20,000 participants with OUD showed that drug treatment days in which benzodiazepines and Z-drugs were taken were associated with an 88% increase in nonfatal overdose; buprenorphine appeared to reduce this risk by almost 40%.
“One of our two primary findings is that patients with opioid use disorder can still benefit substantially from buprenorphine treatment, even if they have benzodiazepines on board,” lead author Kevin Xu, MD, a resident at the Washington University School of Medicine, St. Louis, Missouri, told Medscape Medical News.
The other key finding was that “not all benzodiazepines are equal” and that some are associated with higher risk than others, Xu added.
“If anything, patients who are on buprenorphine and benzodiazepines do not necessarily need to be abruptly tapered off their benzodiazepines. Our data actually demonstrate that there are safe avenues for them,” he added.
The findings were published online March 3 in the American Journal of Psychiatry.
Cloudy Relationship
Buprenorphine is commonly used to treat patients with OUD because of its ability to decrease all-cause mortality. However, up to 30% of these patients also take benzodiazepines for comorbid mood and anxiety disorders, Xu noted.
In addition, recent research shows that benzodiazepine/Z-drug use is associated with a variety of potential adverse effects, including respiratory depression, overdose, and addiction risk.
The relationship between benzodiazepine use and buprenorphine treatment outcomes is poorly characterized in individuals with OUD. Although some studies suggest benzodiazepines may enhance retention in buprenorphine maintenance treatment, others suggest a link to increased adverse events, including all-cause mortality, drug-related poisonings, and accidental injury–related emergency department visits.
In addition, there has been little research on the potential adverse effects associated with use of selective benzodiazepine receptor modulators in patients with OUD. These so-called Z-drugs include zolpidem, zaleplon, and eszopiclone.
Nevertheless, previous research in the general population shows that these medications have a range of adverse effects similar to those of benzodiazepines, with comparable dose-response effects on all-cause mortality.
“The challenge for any clinician is that many patients who are addicted to opioids are also polysubstance users,” said Xu. “There are so many hopeful articles regarding the benefits of buprenorphine treatment in opioid use disorder patients, but it seems like the individuals with polysubstance use are largely ignored in the setting of the opioid epidemic.