Efficacy of long-acting, injectable versus oral naltrexone for preventing admissions for alcohol use disorder

Approximately 17 million Americans and 300 000 veterans have an alcohol use disorder (AUD). Both oral naltrexone (NTX) and long-acting, injectable naltrexone (LAI NTX) are FDA-approved to treat AUD. LAI NTX is often reserved for patients with adherence concerns due to considerable differences in drug cost and administration requirements. To date, there are no randomized trials comparing efficacy of LAI NTX to oral NTX. This retrospective cohort study compared clinical outcomes in veterans treated with LAI NTX or oral NTX.

Health care utilization in veterans at 1 Veterans Affairs facility treated for AUD with oral NTX and LAI NTX was compared. The primary outcome was 90-day alcohol-related hospital admissions per patient (ARA90). Secondary outcomes included 90-day outpatient clinic and emergency department visits and 30-day alcohol-related admissions (ARA30). Inclusion criteria included first-time prescription of NTX for AUD from January 1, 2015, through December 1, 2015. Veterans receiving concurrent acamprosate or disulfiram were excluded.

Seventy-nine patients were included with 65 in the oral NTX group and 14 in the LAI NTX group. The ARA90 was 0.17 for the oral NTX group and 0.64 for the LAI NTX group (P = .06). The oral NTX group had significantly fewer ARA30 than the LAI NTX group (P < .01). Oral NTX also had significantly lower health care utilization for all other parameters.

Oral NTX was associated with lower health care utilization compared to LAI NTX in this veteran population. This indicates that LAI NTX may not provide additional benefit justifying the cost. This study had several limitations. Randomized trials comparing efficacy between oral NTX and LAI NTX are needed.