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Comment & Response |

How Similar Are the Disorders Included Under the Umbrella of Obsessive-Compulsive Disorder and Related Disorders?—Reply

Eric W. Leppink, BA1; Samuel R. Chamberlain, MD, PhD2,3; Jon E. Grant, JD, MD, MPH1
[+] Author Affiliations
1Department of Psychiatry and Behavioral Neuroscience, Pritzker School of Medicine, University of Chicago, Chicago, Illinois
2Department of Psychiatry, University of Cambridge, Cambridge, England
3Cambridge and Peterborough NHS Foundation Trust, Cambridge, England
JAMA Psychiatry. 2016;73(8):877-878. doi:10.1001/jamapsychiatry.2016.1452.
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In Reply Costa and colleagues raise important issues regarding how grooming disorders (GDs) should be optimally treated and classified.

N-acetylcysteine (NAC) showed superiority over placebo as monotherapy in excoriation disorder,1 similar to findings in trichotillomania. However, NAC’s findings in obsessive-compulsive disorder (OCD) are mixed. Two clinical trials reported significant benefits of NAC augmentation over placebo for OCD,2,3 while a third study did not show benefits over placebo.4 As Costa and colleagues suggest, differential pharmacological response across disorders is an important factor when considering diagnostic classification. This is also complicated by differences in study designs, as results may vary when using NAC as augmentation to a selective serotonin reuptake inhibitor rather than a primary intervention.

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August 1, 2016
Daniel L. C. Costa, MD; Juliana Belo Diniz, MD, PhD; Eurípedes Constantino Miguel, MD, PhD
1Department and Institute of Psychiatry, University of Sao Paulo Medical School, Sao Paulo, Brazil
JAMA Psychiatry. 2016;73(8):877. doi:10.1001/jamapsychiatry.2016.1342.
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