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Induction of buprenorphine, an evidence-based treatment for opioid use disorder (OUD), has been reported to be difficult for people with heavy use of fentanyl, the most prevalent opioid in many areas of the country. In this population, precipitated opioid withdrawal (POW) may occur even after individuals have completed a period of opioid abstinence prior to induction. Our objective was to study potential associations between fentanyl, buprenorphine induction, and POW, using social media data. This is a mixed methods study of data from seven opioid-related forums (subreddits) on Reddit. We retrieved publicly available data from the subreddits  via  an application programming interface, and applied natural language processing to identify subsets of posts relevant to buprenorphine induction, POW, and fentanyl and analogs (F&amp;A). We computed mention frequencies for keywords/phrases of interest specified by our medical toxicology experts. We further conducted manual, qualitative, and thematic analyses of automatically identified posts to characterize the information presented.  Results:  In 267,136 retrieved posts, substantial increases in mentions of F&amp;A (3 in 2013 to 3870 in 2020) and POW (2 in 2012 to 332 in 2020) were observed. F&amp;A mentions from 2013 to 2021 were strongly correlated with mentions of POW (Spearman’s  ρ : 0.882;  p  = .0016), and mentions of the  Bernese method  (BM), a microdosing induction strategy (Spearman’s  ρ : 0.917;  p  = .0005). Manual review of 384 POW- and 106 BM-mentioning posts revealed that common discussion themes included “ specific triggers of POW ” (55.1%),  “buprenorphine dosing strategies ” (38.2%) and “ experiences of OUD ” (36.1%). Many reported experiencing POW despite prolonged opioid abstinence periods, and recommended induction  via  microdosing, including specifically  via  the BM. Reddit subscribers often associate POW with F&amp;A use and describe self-managed buprenorphine induction strategies involving microdosing to avoid POW. Further objective studies in patients with fentanyl use and OUD initiating buprenorphine are needed to corroborate these findings.HIGHLIGHTSIncrease in mentions of precipitated opioid withdrawal (POW) on Reddit from 2012 to 2021 was associated with the increase in fentanyl and analog mentions.Experiences of precipitated opioid withdrawal (POW) were described by individuals despite reporting prolonged periods of abstinence compared to standard buprenorphine induction protocols.People with Opioid Use Disorder (OUD) on Reddit are using and recommending microdosing strategies with buprenorphine to avoid POW.People who used fentanyl report experiencing POW following statistically longer periods of abstinence than people who use heroin. Increase in mentions of precipitated opioid withdrawal (POW) on Reddit from 2012 to 2021 was associated with the increase in fentanyl and analog mentions. Experiences of precipitated opioid withdrawal (POW) were described by individuals despite reporting prolonged periods of abstinence compared to standard buprenorphine induction protocols. People with Opioid Use Disorder (OUD) on Reddit are using and recommending microdosing strategies with buprenorphine to avoid POW. People who used fentanyl report experiencing POW following statistically longer periods of abstinence than people who use heroin.

Reddit discussions about buprenorphine associated precipitated withdrawal in the era of fentanyl