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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
medicine
N-Acetyl Cysteine (NAC) in the Treatment of Obsessive-Compulsive Disorder: A 16-Week, Double-Blind, Randomised, Placebo-Controlled Study
CNS Drugs, Volume 29, No. 9, Year 2015
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Description
Background: Obsessive-compulsive disorder (OCD) is a disabling mental illness for which pharmacological and psychosocial interventions are all too often inadequate. Recent preclinical and clinical studies have implicated dysfunction of glutamatergic neurotransmission in the pathophysiology of OCD. The amino acid-based nutraceutical N-acetyl cysteine (NAC) is a safe and readily available agent that has been found to modify the synaptic release of glutamate in subcortical brain regions via modulation of the cysteine-glutamate antiporter. Objective: The aim of this study was to assess the efficacy and safety of NAC in treating OCD. Methods: A 16-week, double-blind, placebo-controlled, randomised trial using 3 g/day of NAC (1.5 g twice daily) in 44 participants (aged 18-70 years) with Diagnostic and Statistical Manual of Mental Disorders, 5th edition (DSM-5)-diagnosed OCD, during 2013-2015. The primary outcome measure was the Yale-Brown Obsessive Compulsive Scale (YBOCS), conducted every 4 weeks. Results: Analysis of the full sample (intention-to-treat) with repeated measures mixed linear modelling revealed a nonsignificant time × treatment interaction for the YBOCS scale total score (p = 0.39). A per-protocol analysis removing protocol violators also failed to show a significant time × treatment interaction for YBOCS total score (p = 0.15). However, a significant time × treatment interaction was observed for the YBOCS 'Compulsions' subscale in favour of NAC (p = 0.013), with a significant reduction observed at week 12 (dissipating at week 16). At 16 weeks, only four (20 %) participants were considered 'responders' (YBOCS ≥35 % reduction at endpoint) versus four (27 %) in the placebo group. The NAC was well-tolerated, aside from more cases of heartburn occurring compared with placebo (p = 0.045). Conclusion: Further research involving NAC for OCD may require larger samples to detect moderate or small effect sizes, involve dosage or formulation differences, use in concert with exposure therapy, or an additional post-study observational period to mitigate study withdrawal. Trial Registration: ACTRN12613000310763. © 2015 Springer International Publishing Switzerland.
Authors & Co-Authors
Sarris, Jerome
Australia, Melbourne
University of Melbourne
Australia, Hawthorn
Swinburne University of Technology
Dean, Olívia May
Australia, Geelong
Barwon Health
Australia, Melbourne
The Florey
Dowling, Nathan L.
Australia, Melbourne
University of Melbourne
Berk, Michael
Australia, Geelong
Barwon Health
Australia, Melbourne
Centre for Youth Mental Health
Australia, Melbourne
The Florey
Ng, Chee H.
Australia, Melbourne
University of Melbourne
Statistics
Citations: 59
Authors: 5
Affiliations: 7
Identifiers
Doi:
10.1007/s40263-015-0272-9
ISSN:
11727047
Research Areas
Disability
Mental Health