Pharmacotherapies to tics: a systematic review

Area of Science:

• Pharmacology
• Neurology
• Evidence-Based Medicine

Background:

• The effectiveness of pharmacotherapies for tic disorders remains uncertain.
• A comprehensive review of existing literature is necessary to guide clinical practice.

Purpose of the Study:

• To systematically evaluate and compare the efficacy and safety of various pharmacotherapies for tic disorders.
• To identify treatments with the optimal balance between therapeutic benefits and adverse effects.

Main Methods:

• A meta-analysis was conducted on 53 trials identified from major databases (Medline, Embase, Cochrane Library, and Chinese databases).
• The Yale Global Tic Severity Scale (YGTSS) was the primary outcome measure.
• Pooled weighted mean differences (WMD) with 95% confidence intervals (CI) were calculated.

Main Results:

• Alpha-2 adrenergic agonists and atypical antipsychotics demonstrated efficacy in reducing tic severity.
• Typical antipsychotics exhibited more severe side effects compared to alpha-2 adrenergic agonists.
• Traditional Chinese Medicine formulations (NingDong Granule, 5-Ling Granule) showed significant improvements in YGTSS scores.
• Glutamate modulators (D-serine, N-Acetylcysteine, riluzole) did not appear effective.

Conclusions:

• Alpha-2 adrenergic agonists present the most favorable profile regarding efficacy and safety for tic management.
• Findings are limited by the small number of trials and sample sizes, necessitating further high-quality research.