Rates of psychotropic medication use reported by borderline patients and axis II comparison subjects over 16 years of prospective follow-up

What This Research Found

Mary Zanarini’s landmark longitudinal study tracked borderline personality disorder patients for 16 years, producing the most comprehensive data ever collected on BPD outcomes. Published in the Journal of Clinical Psychopharmacology and emerging from the McLean Study of Adult Development, this research fundamentally transformed clinical understanding of borderline personality disorder prognosis.

The headline finding is remarkable: 93% of borderline patients achieved symptomatic remission lasting at least 2 years over 16 years of prospective follow-up. This single statistic overturned decades of therapeutic nihilism. Clinicians had long approached BPD as a chronic, treatment-resistant condition—a personality structure so entrenched that meaningful change was unlikely. Zanarini’s data proved otherwise.

The trajectory of improvement revealed predictable patterns. Remission rates increased steadily over time: 35% at 2 years, 49% at 4 years, 68% at 6 years, 73% at 8 years, 85% at 10 years, and 93% by 16 years. The majority of patients who would eventually remit did so within the first decade of follow-up. This timeline has important clinical implications—both for setting realistic expectations and for maintaining therapeutic hope during the difficult early years of treatment.

Recovery, however, proved non-linear. Among patients who achieved remission, approximately 30% experienced recurrence—returning to full diagnostic criteria after a period of symptom-free functioning. Recurrence was most common in the years immediately following remission, becoming less likely as time in remission accumulated. This pattern suggests that early recovery is fragile and requires ongoing support, while sustained remission becomes increasingly stable over time.

Medication use remained high even among remitted patients. This finding challenged simplistic notions of recovery. Patients who no longer met diagnostic criteria for BPD often continued psychotropic medications, suggesting that pharmacotherapy plays an ongoing supportive role in maintaining gains rather than being discontinued upon “cure.” The relationship between medication and recovery appears complex—medications may manage underlying vulnerabilities that, without support, could precipitate relapse.

Functional recovery lagged behind symptomatic recovery. Patients often felt better before they functioned better. The emotional storms might quiet while work performance, relationship stability, and overall life functioning continued to struggle. This temporal gap has important implications for treatment planning—symptom relief is necessary but not sufficient for genuine recovery. Sustained attention to functioning, skills building, and real-world application of therapeutic gains is essential.

Why This Matters for Survivors

If you have been diagnosed with borderline personality disorder, or if you love someone who has, this research offers something precious: evidence-based hope.

The patterns that feel permanent can change. The emotional dysregulation that commandeers your nervous system, the identity confusion that leaves you not knowing who you are from one hour to the next, the relationship chaos that destroys what you most desperately want to preserve—these are not fixed features of your personality but symptoms of a treatable condition. The same neuroplasticity that encoded these patterns can, with time and treatment, encode new ones.

Your suffering is not a life sentence. Ninety-three percent remission is not a hopeful estimate or a best-case scenario—it is what actually happened to real patients tracked over real years. The intense pain you experience now is not your permanent condition. Most people with BPD get substantially better. Not everyone, but most. The odds are genuinely in your favour.

The very instability that causes such suffering enables change. This is perhaps the most paradoxical finding. Unlike narcissistic personality disorder, where rigid defences prevent insight and change, the borderline’s fluid identity allows incorporation of new self-concepts. You have no false self to defend, no grandiose structure that must be maintained at all costs. Your openness to experience—which causes such vulnerability to pain—also creates openness to healing. The chaos contains the seed of recovery.

Time is on your side. BPD symptoms peak in young adulthood and naturally decline with age. This does not mean you should wait passively for improvement, but it does mean that the storm you are in now will not always be this intense. The brain continues developing into the mid-twenties; life experience teaches emotional regulation even without formal therapy. Treatment accelerates this natural trajectory rather than fighting against it.

Your desire for connection, however dysfunctional its expression, is an asset. The desperate attachment, the fear of abandonment, the clinging and pushing away—these reflect a fundamental drive toward relationship that, properly channelled, becomes the engine of recovery. You want love to work. You want relationships to last. This motivation, absent in narcissistic presentations, is precisely what makes treatment effective.

Clinical Implications

For psychiatrists, psychologists, and trauma-informed healthcare providers, Zanarini’s research has direct implications for assessment, treatment planning, and prognostic communication.

Revise your prognostic framework. The therapeutic nihilism that once surrounded BPD is no longer scientifically defensible. When communicating diagnosis, clinicians should convey that BPD is a treatable condition with a favourable trajectory for most patients. The 93% remission rate over 16 years provides concrete grounds for hope. This does not mean minimising the difficulty of the journey, but it does mean not conveying hopelessness.

Plan for long-term engagement. The research shows that remission accumulates over years and decades. Weekly therapy for six months is unlikely to produce lasting change for most patients. Treatment planning should anticipate sustained engagement, with intensity varying based on patient stability but continuity maintained even during remission to prevent relapse. The data on recurrence (30% in the years following initial remission) argues for ongoing supportive contact rather than discharge upon symptom relief.

Address both symptoms and functioning. The temporal gap between symptomatic and functional recovery has important treatment implications. A patient who reports feeling better may still be struggling with work, relationships, and daily life management. Treatment should explicitly target functioning through skills generalisation, supported employment or education, and relationship coaching—not just symptom reduction.

Prepare patients for non-linear progress. Relapse following remission occurs in a significant minority of cases. This should be framed not as treatment failure but as an expected possibility in a complex condition. Patients who understand this are less likely to catastrophise when setbacks occur and more likely to re-engage with treatment rather than abandoning hope.

Consider medication as supportive rather than curative. The finding that remitted patients often continue psychotropic medications suggests that pharmacotherapy manages underlying vulnerabilities rather than eliminating them. Medication should be presented as one component of a comprehensive treatment approach, potentially continuing even after behavioural symptoms resolve. Premature discontinuation may precipitate relapse.

Differentiate BPD prognosis from NPD prognosis. In clinical settings where Cluster B presentations overlap, the dramatically different trajectories of borderline and narcissistic pathology matter for treatment planning and family guidance. BPD responds to treatment and often improves naturally; NPD shows minimal response to intervention. These differences should inform how clinicians counsel patients and their families about expected outcomes.

Broader Implications

This research extends beyond individual therapy rooms to illuminate patterns visible in families, organisations, and social systems where borderline and narcissistic dynamics intersect.

Therapeutic Hope Versus Therapeutic Nihilism

The history of BPD treatment reveals how professional pessimism becomes self-fulfilling prophecy. When clinicians believe a condition is untreatable, they avoid treating it, refer patients elsewhere, or engage half-heartedly. Patients sense this hopelessness and internalise it. Zanarini’s research provides the empirical foundation for therapeutic hope—not naive optimism, but grounded expectation of probable improvement. This hope itself becomes therapeutic, influencing both clinician behaviour and patient engagement.

The Contrasting Trajectories of Cluster B Disorders

The 93% remission rate for BPD stands in stark contrast to the treatment resistance characteristic of narcissistic personality disorder. Understanding these different trajectories has implications for resource allocation, family guidance, and clinical specialisation. The same investment of therapeutic time and energy yields dramatically different returns depending on which Cluster B presentation is being treated. This is not a value judgement but a clinical reality that should inform how systems deploy limited mental health resources.

Family Systems and Survivor Recovery

Many survivors of narcissistic abuse carry borderline features themselves—unsurprisingly, given the attachment disruption and identity damage that narcissistic parenting or partnership causes. The research offers these survivors particular hope: the patterns installed by narcissistic abuse are not permanent. The hypervigilance, emotional dysregulation, and relationship chaos that developed as survival adaptations can resolve with appropriate treatment. Survivors are not doomed to replicate what was done to them.

The Nature of Personality Change

This research contributes to fundamental questions about whether personality can change. The traditional view—that personality structure is fixed by early adulthood—is increasingly challenged by longitudinal data showing substantial change across the lifespan. BPD’s 93% remission rate demonstrates that even severe personality pathology is amenable to intervention. This has implications beyond clinical settings, informing how we think about criminal justice, parenting support, and social policy.

Neuroplasticity and Adult Development

The improvement trajectory documented in this research aligns with broader understanding of adult neuroplasticity. The brain retains capacity for change throughout life, though the mechanisms differ from childhood development. BPD improvement appears to involve prefrontal cortex maturation, strengthening of regulatory circuits, and new learning that gradually overwrites maladaptive patterns. Understanding these mechanisms informs treatment design and offers biological grounding for therapeutic optimism.

Healthcare Resource Allocation

The research has implications for how healthcare systems fund and structure BPD treatment. The data support intensive, long-term intervention as cost-effective when compared to the alternative: repeated crises, emergency department visits, hospitalisations, and lost productivity across decades of untreated illness. Investment in evidence-based BPD treatment is not just clinically appropriate but economically rational. Healthcare systems that limit BPD treatment to brief interventions are making a false economy.

Limitations and Considerations

No research is without limitations, and responsible engagement with this paper requires acknowledging several constraints.

Selection bias affects generalisability. Participants were patients at McLean Hospital, a specialised psychiatric facility. They may not represent the broader population of individuals with BPD, particularly those who never seek treatment or who receive only brief interventions. The 93% remission rate applies to patients who remained engaged with mental health services over 16 years—itself a selected group. Those who died, were lost to follow-up, or disengaged from treatment may have had different outcomes.

Remission is defined diagnostically, not experientially. No longer meeting DSM criteria for BPD does not mean the person feels “cured” or functions normally. Many remitted patients continue to experience emotional sensitivity, relationship difficulties, and subclinical symptoms. The research measures a threshold crossing, not a complete transformation.

Medication effects and psychotherapy effects are confounded. The study tracked medication use but did not randomise patients to different treatments. It cannot determine whether improvement resulted from medications, psychotherapy, natural maturation, or their combination. The finding that remitted patients often continue medications raises questions about whether they might relapse without pharmacological support.

Historical context affects interpretation. The study began in 1992, before some current evidence-based treatments (like DBT) were widely available. Treatment received by early cohort participants differs from contemporary best practice. Current patients receiving state-of-the-art intervention might achieve faster or higher remission rates.

Individual variation is substantial. The 93% remission rate is a group statistic. Individual patients cannot be told with certainty whether they will be in the 93% who remit or the 7% who do not. Personal factors—including treatment access, social support, comorbid conditions, and individual neurobiological differences—influence outcomes in ways the group data cannot capture.

How This Research Is Used in the Book

This research is cited in Chapter 2: The Four Masks and Chapter 3: The Borderline Sibling to provide evidence-based context for understanding BPD prognosis and its contrast with narcissistic personality disorder.

In Chapter 2, the citation supports discussion of hopeful outcomes for Cluster B disorders:

“Long-term follow-up studies show prognosis better than clinicians once believed: many individuals achieve significant improvement or remission. The McLean Study of Adult Development found that 93% of borderline patients achieved remission (no longer meeting diagnostic criteria) lasting at least 2 years over 16 years of follow-up, though 30% experienced recurrence.”

This statistic directly challenges therapeutic nihilism, establishing that Cluster B disorders—at least for borderline presentations—are treatable conditions rather than fixed personality structures.

In Chapter 3, the research appears in the context of comparing borderline and narcissistic treatment responsiveness:

“Long-term outcome studies provide genuine optimism. The McLean Study tracked borderline patients for over two decades: 85 percent achieved remission within 10 years, though relapses occur. Patients feel better before they function better, but functioning continues improving over time.”

And crucially, in explaining why borderline pathology responds to treatment while narcissism does not:

“Borderline instability, remarkably, enables change. Fluid identity allows incorporation of new self-concepts—instability makes change inevitable while suffering makes it necessary.”

The research provides empirical grounding for one of the book’s core distinctions: the borderline can heal because their very instability permits new patterns; the narcissist remains frozen at the pool because their rigid false self cannot be relinquished. Echo learns to speak; Narcissus cannot look away.

Historical Context

The publication of this research in 2012 marked a turning point in clinical understanding of borderline personality disorder. To appreciate its significance, one must understand the professional pessimism it overturned.

For decades, BPD was considered a “wastebasket diagnosis”—applied to difficult patients who did not fit other categories and who exhausted their treatment providers. Clinicians openly avoided borderline patients. Training programmes warned residents about the impossibility of effective treatment. Insurance companies limited coverage based on assumptions of chronicity. Patients were told, explicitly or implicitly, that their condition was permanent.

This pessimism had tragic consequences. Patients internalised hopelessness, reducing their engagement with treatment. Clinicians provided half-hearted intervention, expecting failure. Families were counselled to accept that their loved one would never improve. The prophecy fulfilled itself.

Zanarini’s research emerged from the McLean Study of Adult Development, a prospective longitudinal investigation that began in 1992 and has continued for over three decades. Unlike retrospective studies that rely on patient recall, the McLean Study followed patients forward in time with systematic assessments at regular intervals. This methodology provides the rigorous evidence needed to challenge entrenched clinical assumptions.

The 2012 publication synthesised 16 years of data, demonstrating rates of improvement that clinicians had never imagined. Subsequent publications have extended the follow-up, confirming and strengthening the original findings. The study has been cited over 500 times and is now foundational to evidence-based BPD treatment.

The transformation in clinical attitude has been remarkable. Contemporary training programmes teach BPD as a treatable condition. Specialised treatment programmes have proliferated. Insurance coverage has improved (though barriers remain). Most importantly, patients now receive a fundamentally different prognostic message: recovery is possible and probable.

Further Reading

• Zanarini, M.C. et al. (2010). Time-to-attainment of recovery from borderline personality disorder and stability of recovery: A 10-year prospective follow-up study. American Journal of Psychiatry, 167(6), 663-667.
• Gunderson, J.G. et al. (2011). Ten-year course of borderline personality disorder: Psychopathology and function from the Collaborative Longitudinal Personality Disorders Study. Archives of General Psychiatry, 68(8), 827-837.
• Paris, J. (2015). A concise guide to personality disorders. American Psychological Association.
• Linehan, M.M. (2015). DBT Skills Training Manual (2nd ed.). Guilford Press.
• Bateman, A. & Fonagy, P. (2016). Mentalization-Based Treatment for Personality Disorders: A Practical Guide. Oxford University Press.