Effects of a web‐based relapse prevention program on abstinence: Secondary subgroup analysis of a pilot randomized controlled trial

Abstract Aim The effect of a web‐based relapse prevention program might vary depending on a specific population if the study participants included drug users with various characteristics. This secondary analysis explored subgroups among Japanese drug users that may benefit from a web‐based relapse prevention program. Methods Outpatients with drug use disorder (n = 48) were randomly assigned to an 8‐week, six‐session web‐based relapse prevention program (intervention group) or web‐based self‐monitoring only (control group). We tested the effects of the intervention on abstinence in different subgroups divided by a primary abused drug (methamphetamine vs other drugs), previous face‐to‐face relapse prevention (received vs not received), and outpatient treatment term (long‐term: ≥3 years vs short‐term: