Longitudinal examination of borderline personality disorder symptoms and drug use: The influence of negative and positive emotion dysregulation

Borderline personality disorder (BPD) is associated with greater substance use. Emotion dysregulation has been implicated in both BPD and substance use, yet there is limited research examining the role of emotion dysregulation in the BPD–substance use relation. We examined the independent and interactive associations of BPD symptoms and emotion dysregulation in reported drug use over 1 year. Participants (N = 143) were over‐recruited for BPD, assessed via interview, and completed measures of negative and positive emotion dysregulation. Drug use frequency was assessed with monthly surveys over a 1‐year period. Results demonstrated interrelations among BPD symptoms and both negative and positive emotion dysregulation. However, when modeling BPD and emotion dysregulation together, only higher BPD symptoms were associated with more frequent drug use. Findings support the relation of BPD symptoms and emotion dysregulation but suggest that emotion dysregulation may not account for drug use frequency above and beyond BPD in community‐recruited populations.