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Botulinum toxin treatment improves depression and anxiety but not sleep disturbance in cervical dystonia patients

This meta-analysis of 42 studies found that non-motor symptoms are highly prevalent in cervical dystonia, with sleep disturbance affecting 57.1% and fatigue 60.6% of patients. Botulinum toxin treatment produced modest improvements in depression (SMD = -0.31) and anxiety (SMD = -0.23), but no significant benefit for sleep disturbance.

Last updated: Aug 18, 2026•0 RCTs•1 Meta-analyses•📖 Read as article →

Evidence Score

Evidence Score53/100
Human RCT☆☆☆☆☆
Meta-analysis★★★☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Prevalence and treatment effects on non-motor symptoms in cervical dystonia: A systematic review and meta-analysis.

observational

Zhuang Z, Wang X, Fan S, Lv Q, Zhai J, Wang J, Li H · Clinical parkinsonism & related disorders (2026)

Participants: N/A
Duration: N/A
Intervention: Botulinum toxin (BoNT) treatment
Outcome: Depression, anxiety, sleep disturbance prevalence and treatment effects
Effect Size: Depression SMD = -0.31; Anxiety SMD = -0.23; Sleep disturbance not significant
Population: Patients with cervical dystonia (CD)

Result:

PubMed: 42592252DOI: 10.1016/j.prdoa.2026.100489

Mechanism Graph

Botulinum toxin injection reduces muscle spasms in cervical dystonia
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Reduced muscle tension may alleviate physical discomfort and pain
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Improved physical symptoms may lead to psychological relief, reducing depression and anxiety
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No effect on sleep disturbance, suggesting sleep issues may be independent of motor symptoms

Limitations

  • ⚠Substantial heterogeneity persisted across most analyses (I2 values 54.9% to 85.8%)
  • ⚠Assessment tool type was a major source of heterogeneity, indicating lack of standardized NMS assessment
  • ⚠Evidence base for NMS interventions remains preliminary, with few trials explicitly aimed at NMS

Frequently Asked Questions

What is the prevalence of sleep disturbance in cervical dystonia?▼

The pooled prevalence of sleep disturbance in cervical dystonia was 57.1% (95% CI, 46.7% to 67.2%).

Does botulinum toxin treatment improve depression in cervical dystonia?▼

Yes, botulinum toxin treatment produced a modest improvement in depression with a standardized mean difference of -0.31.

Does botulinum toxin treatment improve sleep disturbance in cervical dystonia?▼

No, the meta-analysis found no significant benefit of botulinum toxin treatment for sleep disturbance.

What was the most consistent source of heterogeneity in this meta-analysis?▼

Assessment tool type was the most consistent source of heterogeneity across outcomes, highlighting the need for standardized NMS assessment protocols.

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References

  1. 1.Zhuang Z, Wang X, Fan S, Lv Q, Zhai J, Wang J, Li H. "Prevalence and treatment effects on non-motor symptoms in cervical dystonia: A systematic review and meta-analysis.." Clinical parkinsonism & related disorders, 2026. PMID: 42592252 DOI: 10.1016/j.prdoa.2026.100489
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.