Pregabalin augmentation in treatment-resistant obsessive–compulsive disorderOulis, Panagiotis; Mourikis, Iraklis; Konstantakopoulos, GeorgeInternational Clinical Psychopharmacology: July 2011 - Volume 26 - Issue 4 - p 221–224 doi: 10.1097/YIC.0b013e3283466657 Short Communication Abstract Author Information The therapeutic limitations of mainstay psychopharmacological treatments of obsessive–compulsive disorder (OCD) warrant the clinical testing of further add-on agents to improve patients' clinical symptoms. One such agent might be pregabalin, which has been found efficacious in other anxiety disorders. We report on the findings of a small, 8-week open-label trial of adjunctive pregabalin with a 4-week follow-up in 10 OCD patients resistant or only partial responders to a combination of serotonin reuptake inhibitors with atypical antipsychotics. Adjunctive pregabalin at 225–675 mg/d was well tolerated and led to patients' substantial improvement in their OCD symptoms, as reflected in their scores on the Yale–Brown Obsessive Compulsive Scale. Despite the several limitations of the study, its results suggest that adjunctive pregabalin might be a safe and efficacious new augmentation agent in the treatment of drug-resistant OCD. We hypothesize that pregabalin's mechanism of action in OCD might consist in its inhibition of glutamatergic neurotransmission. First Department of Psychiatry, Athens University Medical School, Eginition Hospital, Athens, Greece Correspondence to Panagiotis Oulis, MD, Eginition Hospital, 74, Vas. Sofias avenue, 11528, Athens, Greece Tel: +30 210 7289137; fax: +30 210 7242020; e-mail: firstname.lastname@example.org Received October 30, 2010 Accepted March 3, 2011 © 2011 Lippincott Williams & Wilkins, Inc.