Personality Disorders and Addiction: Understanding Complex Co-Occurring Conditions

Introduction

Personality disorders — enduring patterns of inner experience and behavior that deviate markedly from cultural expectations and cause significant distress or impairment — are among the most commonly co-occurring conditions in people with addiction. Research consistently shows that people with personality disorders have elevated rates of substance use disorder, and that co-occurring personality disorders significantly complicate addiction treatment. Understanding the relationship between personality disorders and addiction is essential for effective treatment of both conditions.

Key Definitions

Personality disorder: An enduring pattern of inner experience and behavior that deviates markedly from cultural expectations, is pervasive and inflexible, has an onset in adolescence or early adulthood, is stable over time, and leads to distress or impairment.

Borderline personality disorder (BPD): A personality disorder characterized by instability in interpersonal relationships, self-image, and emotions, and marked impulsivity. The personality disorder most strongly associated with addiction.

Antisocial personality disorder (ASPD): A personality disorder characterized by a pervasive pattern of disregard for and violation of the rights of others. Strongly associated with substance use disorders.

Cluster B personality disorders: The "dramatic, emotional, or erratic" cluster — including BPD, ASPD, narcissistic, and histrionic personality disorders. Most strongly associated with addiction.

DBT (Dialectical Behavior Therapy): The gold-standard treatment for BPD, also effective for addiction.

Prevalence

The co-occurrence of personality disorders and addiction is extremely common:

Approximately 40-70% of people with addiction have a co-occurring personality disorder.
BPD is the most common personality disorder in addiction treatment settings — affecting approximately 20-30% of people seeking addiction treatment.
ASPD is also common — affecting approximately 15-25% of people seeking addiction treatment.
Co-occurring personality disorders are associated with worse treatment outcomes — more severe addiction, higher dropout rates, and higher relapse rates.

Borderline Personality Disorder and Addiction

BPD and addiction have a particularly strong relationship:

Shared features: BPD and addiction share several features — impulsivity, emotion dysregulation, self-destructive behavior, and unstable relationships. These shared features reflect overlapping neurobiological mechanisms.

Self-medication: People with BPD use substances to manage the intense emotional dysregulation that characterizes BPD — numbing painful emotions, reducing anxiety, and managing the emptiness and boredom that are common in BPD.

Impulsivity: The impulsivity of BPD increases the risk of substance use initiation and escalation. Impulsive substance use is a common feature of BPD.

Treatment: DBT is the gold-standard treatment for BPD and has also been shown to be effective for addiction. DBT-SUD (DBT adapted for substance use disorders) addresses both conditions simultaneously.

Antisocial Personality Disorder and Addiction

ASPD and addiction are strongly associated:

Shared features: ASPD and addiction share features including impulsivity, disregard for consequences, and sensation-seeking. These shared features reflect overlapping neurobiological mechanisms — particularly prefrontal cortex hypofunction and dopamine system dysregulation.

Treatment challenges: People with ASPD are often difficult to engage in treatment — due to their disregard for rules and authority, their tendency to manipulate, and their limited motivation for change. Motivational interviewing and contingency management are particularly important for engaging people with ASPD in treatment.

Treatment Approaches

DBT: DBT is the most evidence-based treatment for co-occurring BPD and addiction. DBT-SUD adapts DBT for substance use disorders, addressing both conditions simultaneously.

Schema therapy: Schema therapy — which addresses the early maladaptive schemas (deep-seated beliefs about the self and the world) that underlie personality disorders — has shown promise for co-occurring personality disorders and addiction.

Motivational interviewing: MI is particularly important for engaging people with personality disorders in treatment, given their often ambivalent or resistant motivation for change.

Trauma-informed care: Many people with personality disorders have significant trauma histories. Trauma-informed care is essential for effective treatment.

Frequently Asked Questions

Can personality disorders be treated?
Yes. Personality disorders — including BPD and ASPD — can be effectively treated with evidence-based therapies. DBT has the strongest evidence base for BPD. Treatment typically requires longer-term engagement than treatment for other mental health conditions.

Is BPD the same as bipolar disorder?
No. BPD and bipolar disorder are distinct conditions, though they share some features — including mood instability and impulsivity. BPD is characterized by mood instability in response to interpersonal events; bipolar disorder is characterized by distinct episodes of mania and depression that are not necessarily triggered by interpersonal events. Accurate diagnosis is important for appropriate treatment.

Key Takeaways

Personality disorders co-occur in 40-70% of people with addiction, with BPD and ASPD being the most common.
BPD and addiction share features including impulsivity, emotion dysregulation, and self-destructive behavior.
DBT is the gold-standard treatment for co-occurring BPD and addiction.
Trauma-informed care is essential for people with personality disorders, given their high rates of trauma history.
Co-occurring personality disorders complicate addiction treatment but do not preclude recovery.

Additional Resources

Related articles on Sobriety Navigator: Dialectical Behavior Therapy for Addiction, Trauma and Brain Changes, Shame and Recovery, Cognitive Behavioral Therapy for Addiction.