A 42-year-old woman with major depressive disorder has been on sertraline 100 mg daily for 6 weeks. She reports persistent depressive symptoms with no improvement. She denies suicidal ideation, and tolerates the medication well without adverse effects. What is the most appropriate next step in management?

Explanation

## Management of SSRI Non-Response in Depression ### Clinical Context This patient has been on sertraline for 6 weeks with inadequate response but good tolerability and no safety concerns. The standard approach to SSRI non-response follows a stepwise algorithm. ### Dose Escalation Rationale **Key Point:** The first step in managing inadequate SSRI response is dose escalation, provided the patient tolerates the current dose without adverse effects and there are no contraindications. - Sertraline 100 mg is a standard therapeutic dose, but the range extends to 200 mg daily - Increasing to 150 mg daily allows optimization within the same drug class - Response assessment requires 2–4 weeks at the new dose (therapeutic lag for dose changes) - This approach avoids unnecessary polypharmacy and maintains medication continuity ### Timeline of Antidepressant Response **High-Yield:** Full therapeutic response to SSRIs typically requires 6–8 weeks at an adequate dose. At 6 weeks, the patient may still be in the response window. ### When to Consider Alternatives **Clinical Pearl:** Only after adequate dose escalation (usually to 150–200 mg) and a further 2–4 week trial should you consider: - Switching to a different SSRI or SNRI - Augmentation strategies (buspirone, aripiprazole, bupropion) - TCAs or MAOIs (reserved for treatment-resistant cases) ### Why Not Switch or Augment Yet? - The patient has not yet received an optimized dose of the current agent - Switching to TCAs or MAOIs is premature without exhausting SSRI optimization - Augmentation is typically considered after 8–12 weeks of adequate dosing, not at 6 weeks [cite:Harrison 21e Ch 470] ```mermaid flowchart TD A[SSRI at standard dose<br/>6 weeks, inadequate response]:::outcome --> B{Tolerating<br/>current dose?}:::decision B -->|No - adverse effects| C[Reduce dose or switch SSRI]:::action B -->|Yes - good tolerability| D[Increase dose<br/>150-200 mg daily]:::action D --> E[Reassess in 2-4 weeks]:::action E --> F{Response achieved?}:::decision F -->|Yes| G[Continue maintenance]:::action F -->|No| H[Consider augmentation<br/>or switch]:::action ```