Induction to Methadone 80 mg in the First Week of Treatment of Patients Who Use Fentanyl: A Case Series From an Outpatient Opioid Treatment Program.

Objectives: Current guidelines for methadone titration may unnecessarily delay reaching effective doses for patients using fentanyl, resulting in an increased risk of ongoing fentanyl use, dissatisfaction with treatment, and early dropout. Development and evaluation of rapid methadone induction protocols may improve treatment for patients using fentanyl.

Methods: Retrospective chart review was conducted for patients admitted in 2022 to a single licensed opioid treatment program (OTP) where a rapid induction protocol provides methadone 40 mg on day 1, 60 mg on day 2, and 80 mg on day 3 to patients using fentanyl <65 years old without significant medical comorbidities. The primary feasibility outcome was completion of the protocol, defined by receipt of methadone dose 80 mg or more on treatment day 7. The primary safety outcomes were oversedation, nonfatal overdose, and death. A secondary outcome was retention in treatment at 30 days.

Results: Rapid induction was ordered for 93 patients and completed by 65 (70%). Average dose on day 7 for patients who completed was 89 mg (SD 9.5 mg) versus 49 mg (SD 14.0 mg) for those who did not. No episodes of oversedation, nonfatal overdose, or death were observed. At 30 days, 85% of the patients who had the rapid protocol ordered (79/93) were retained, with 88% (57/65) who completed the protocol retained versus 79% (22/28) who did not complete (OR 1.9, 95% CI 0.6-6.2).

Conclusions: Rapid induction to methadone 80 mg by day 7 was feasible for outpatients using fentanyl in this study at a single OTP. No significant safety events were identified.