A 32-year-old man with a lifelong pattern of grandiosity, need for excessive admiration, lack of empathy, and interpersonal exploitativeness presents to psychiatry. He has difficulty maintaining relationships and shows rage when criticized. Which is the drug of choice for managing his affective dysregulation and impulsivity?

Explanation

## Pharmacotherapy of Cluster B Personality Disorders **Key Point:** Narcissistic Personality Disorder (NPD) and other Cluster B disorders (Borderline, Antisive, Histrionic) lack specific FDA-approved pharmacotherapy. However, SSRIs are first-line for affective dysregulation, impulsivity, and anger outbursts that often accompany these conditions. ### Rationale for SSRI (Sertraline) **High-Yield:** SSRIs target: - Affective instability and mood lability - Impulsive aggression and rage responses - Comorbid anxiety and depression - No direct effect on core personality traits (grandiosity, lack of empathy), but improve functional outcomes **Clinical Pearl:** In Cluster B disorders, pharmacotherapy addresses *state symptoms* (anger, dysphoria, impulsivity) rather than *trait pathology* (narcissism, antisocial features). Sertraline is preferred over other SSRIs due to good tolerability and evidence in anger/impulsivity reduction. ### Why Other Options Fail | Drug | Role in Cluster B | Limitation | |------|-------------------|------------| | **Haloperidol** | Reserved for acute aggression/psychotic features | Antipsychotics not first-line for personality disorders; risk of tardive dyskinesia with chronic use | | **Lithium** | Mood stabilizer for bipolar affective instability | Not indicated unless comorbid bipolar disorder; requires monitoring; no evidence in pure NPD | | **Buspiron** | Anxiolytic for generalized anxiety | Does not target impulsivity or anger; weaker evidence than SSRIs | **Mnemonic: SSRI-FIRST** — SSRIs are the initial pharmacological choice for affective dysregulation in Cluster B (anger, impulsivity, mood lability).