E1 ReplicatedModerate confidencePEM not requiredRCTPeer-reviewedMachine draft
Cognitive-behavioural therapy v. mirtazapine for chronic fatigue and neurasthenia: randomised placebo-controlled trial.
Stubhaug, Bjarte, Lie, Stein Atle, Ursin, Holger et al. · The British journal of psychiatry : the journal of mental science · 2008 · DOI
Quick Summary
This study tested whether a structured talk therapy program (cognitive-behavioural therapy) and/or a medication called mirtazapine could help people with chronic fatigue. Seventy-two patients were divided into groups receiving either the therapy program, the medication, or a placebo (fake pill). The therapy program worked best in the first 12 weeks, but when patients combined therapy first with medication afterward, they showed the most improvement by week 24.
Why It Matters
This study provides evidence that a combination approach—specifically therapy followed by medication—may be more effective than either treatment alone for chronic fatigue. Understanding optimal treatment sequencing and the potential value of multimodal interventions is important for developing better management strategies for ME/CFS patients.
Observed Findings
- CCBT alone showed significant improvement in fatigue symptoms and clinical impression by 12 weeks compared to medication and placebo.
- Sequential treatment (CCBT for 12 weeks followed by mirtazapine for 12 weeks) produced the most significant improvement by 24 weeks on both primary outcome measures.
- Secondary outcome measures showed overall improvement across groups with no significant differences between treatment arms.
- The order of interventions appeared to influence treatment effectiveness.
- Placebo and mirtazapine alone did not show statistically significant superiority over CCBT at 12 weeks.
Inferred Conclusions
- Multimodal interventions combining therapy and medication may have additive or synergistic benefits in chronic fatigue management.
- The sequence of interventions—starting with therapy before medication—appears to be clinically important for optimal outcomes.
- Comprehensive cognitive-behavioural therapy shows promise as an initial treatment before considering pharmacological augmentation.
Remaining Questions
- Why does the sequence of treatment matter, and what are the mechanisms underlying the superiority of CCBT-then-medication over other sequences?
- Do these findings generalize to ME/CFS populations beyond specialist clinic referrals, and what are the long-term outcomes beyond 24 weeks?
What This Study Does Not Prove
This study does not establish that these treatments cure chronic fatigue or work equally well in all patient populations. The relatively small sample size (n=72), short follow-up period (24 weeks), and focus on a specialist clinic population limit generalizability. The mechanisms underlying why sequence matters remain unclear from this data alone.
Tags
Symptom:Fatigue
Method Flag:PEM Not DefinedWeak Case DefinitionSmall Sample
Metadata
- DOI
- 10.1192/bjp.bp.106.031815
- PMID
- 18310583
- Review status
- Machine draft
- Evidence level
- Replicated human evidence from multiple independent studies
- Last updated
- 8 April 2026
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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