Do Not Reduce Sertraline and Add Bupropion
When depression worsens on sertraline 150mg, you should NOT reduce the dose to 100mg while adding bupropion—this strategy lacks evidence and risks undertreating the patient. Instead, either switch to a different antidepressant OR augment the current sertraline dose (keeping it at 150mg) with bupropion.
Why Dose Reduction is Problematic
Reducing sertraline from 150mg to 100mg while depression is worsening contradicts basic pharmacologic principles. The patient is already failing at the higher dose, so lowering it will likely worsen outcomes. Research shows sertraline's therapeutic response increases with dosage, and the optimal balance of efficacy and safety occurs between 50-150mg 1. Dropping to 100mg when already failing at 150mg removes therapeutic benefit without clear rationale.
Evidence-Based Alternatives
Option 1: Augmentation (Preferred if Patient Has Partial Response)
Keep sertraline at 150mg and ADD bupropion 150-300mg daily 2. This strategy is supported by:
- Multiple studies showing bupropion augmentation of SSRIs produces 54-78% response rates in partial responders 3, 4
- The STAR*D trial found similar efficacy between augmenting with bupropion versus switching strategies 5, 6
- Bupropion addresses different neurotransmitter systems (dopamine/norepinephrine) than sertraline (serotonin), providing complementary mechanisms 3, 7
- Additional benefit: bupropion has significantly lower sexual dysfunction rates than SSRIs and may actually reverse SSRI-induced sexual side effects 2, 3
Practical approach: Start bupropion SR 150mg daily, increase to 300mg after 1-2 weeks if tolerated. Monitor closely for the first 1-2 weeks as guidelines recommend 2.
Option 2: Switch to Different Antidepressant
If the patient shows NO response (not just partial response) after 6-8 weeks on sertraline 150mg, switching is appropriate 2. Evidence shows no significant differences in efficacy when switching between second-generation antidepressants 5, 6.
Switching strategy: Gradually taper sertraline over days to weeks to avoid discontinuation syndrome (sertraline is associated with this risk) 8, 9. Then start the new antidepressant. Conservative approaches involve a washout period, though cross-tapering can be done with clinical expertise 9.
Critical Safety Considerations
Monitor for Worsening Depression and Suicidality
- SSRIs carry increased risk for suicide attempts, especially in the first 1-2 months 2
- Assess patient status within 1-2 weeks of any medication change 2
- Watch for agitation, irritability, or unusual behavior changes indicating worsening depression 2
Bupropion-Specific Warnings
When adding bupropion, screen for contraindications 10:
- Seizure risk: Bupropion lowers seizure threshold; avoid in patients with seizure disorders, eating disorders, or abrupt alcohol/benzodiazepine discontinuation 2
- Hypertension: Monitor blood pressure—bupropion can elevate BP 10
- Bipolar disorder: Screen for bipolar history as bupropion can precipitate mania 10
Drug Interactions
Bupropion inhibits CYP2D6, which can increase sertraline levels 10. While one study showed bupropion affected venlafaxine but not SSRI levels 11, monitor for increased sertraline side effects (nausea, diarrhea, activation).
Timeline for Assessment
Give the new strategy 6-8 weeks before declaring treatment failure 2. However, some improvement should be evident by 2-4 weeks. If no improvement after adequate trial, consider further modifications.
Bottom Line Algorithm
- Has patient been on sertraline 150mg for at least 6-8 weeks? If no, optimize duration first.
- Is there ANY response (even partial)? If yes → augment with bupropion 150-300mg while maintaining sertraline 150mg.
- Is there ZERO response? If yes → switch to different antidepressant (not dose reduction).
- Never reduce a failing antidepressant dose while adding another agent—this combines the worst of both strategies.