Switching from Lexapro (Escitalopram) 10mg to Wellbutrin (Bupropion)
When switching from escitalopram 10 mg to bupropion, use a direct switch approach: start bupropion 150 mg once daily in the morning while simultaneously tapering escitalopram over 1-2 weeks to minimize discontinuation symptoms, then increase bupropion to 300 mg daily after 4-7 days if tolerated.
Switching Strategy
The evidence supports a direct switch with brief overlap rather than a prolonged washout period. Unlike switching to/from MAOIs (which requires 14 days), transitioning between escitalopram and bupropion does not require a washout period 1.
Step-by-Step Protocol:
Week 1:
- Start bupropion 150 mg once daily in the morning
- Continue escitalopram 10 mg daily
- Monitor for tolerability
Week 2:
- Reduce escitalopram to 5 mg daily (or every other day)
- Continue bupropion 150 mg daily
- This taper minimizes SSRI discontinuation syndrome 2
Week 2-3:
- Discontinue escitalopram completely
- Increase bupropion to 300 mg once daily (after 4-7 days at 150 mg if tolerated) 1
Week 4-6:
- Assess response at 6-8 weeks on therapeutic dose 3
- Follow-up within 1-2 weeks initially to monitor for adverse effects and suicidality 3
Clinical Rationale
Research directly comparing these medications shows comparable efficacy for major depression. A 2019 randomized trial demonstrated non-inferiority of bupropion XL versus escitalopram, with response rates of 69.6% vs 72.9% respectively 4. Both medications effectively reduce depression symptoms in patients with comorbid conditions 5.
Key advantage of bupropion: Significantly lower rates of sexual dysfunction compared to escitalopram 3, 5. If sexual side effects were problematic on escitalopram, this switch is particularly appropriate.
Critical Safety Considerations
Contraindications to Bupropion:
- Seizure disorders or conditions lowering seizure threshold (stroke, brain metastases, eating disorders like anorexia/bulimia) 6, 1
- Current MAOI use or within 14 days 1
- Uncontrolled hypertension (use with caution) 7
- Concurrent opioid therapy (naltrexone-containing formulations only) 7
Monitor Closely:
- Suicidality: All antidepressants carry this risk, particularly in first 1-2 months. Assess within 1-2 weeks of initiation 3, 1
- Seizure risk: Dose-dependent; keep maximum at 300 mg/day for immediate release formulations, 450 mg/day for XL 1
- Neuropsychiatric symptoms: Agitation, insomnia, anxiety (bupropion is activating) 8, 9
- Blood pressure and heart rate: Can increase with bupropion 7
Avoiding Common Pitfalls
Do NOT abruptly stop escitalopram - this causes discontinuation syndrome (dizziness, paresthesias, flu-like symptoms, mood changes) 2. The taper minimizes this risk.
Do NOT combine with tramadol or other medications lowering seizure threshold without careful consideration 9.
Take bupropion in the morning - not late in day - to minimize insomnia risk 8, 1.
Swallow extended-release formulations whole - do not crush, divide, or chew 1.
When This Switch is Particularly Appropriate
- Sexual dysfunction on escitalopram (bupropion has significantly lower rates) 3, 5
- Fatigue/low energy as prominent symptoms (bupropion is activating) 8
- Concurrent smoking cessation goals (bupropion FDA-approved for this) 6
- Weight gain concerns (bupropion associated with weight loss/neutrality vs SSRIs) 10, 11
Alternative Approach if Needed
If there was partial response to escitalopram rather than complete non-response, combination therapy (adding bupropion to escitalopram) may be superior to switching. One study showed combination therapy achieved 28% remission vs 7% with switching to monotherapy 12. However, this increases pill burden and cost.