title: Ondansetron augmentation in treatment-resistant obsessive-compulsive disorder: a preliminary, single-blind, prospective study.
abstract: Serotonin and dopamine neuronal systems have been implicated in the modulation of obsessive-compulsive disorder (OCD) symptoms. About 40% of OCD patients do not respond to first-line selective serotonin reuptake inhibitor (SSRI) treatment; among those, dopamine blocker augmentation has been reported to improve the rate of response by an additional one-third. Given that serotonin 5-HT(3) receptors are indirect inhibitors of cortico-mesolimbic dopamine release, augmentation with the 5-HT(3) receptor antagonist ondansetron in combination with SSRIs and antipsychotics has potential efficacy in treatment-resistant OCD patients. To assess the efficacy and tolerability of ondansetron in combination with SSRIs and antipsychotics in patients with treatment-resistant OCD. In total, 14 patients with a DSM-IV diagnosis of OCD, who were treatment resistant and receiving stable treatment with SSRIs and antipsychotic augmentation, entered a 12-week, single-blind trial of ondansetron. The drug was initiated at a dosage of 0.25 mg twice daily for 6 weeks and was then titrated to 0.5 mg twice daily for 6 weeks. Of the 14 patients, nine (64.3%) experienced a treatment response (> or =25% reduction in the Yale-Brown Obsessive Compulsive Scale [YBOCS] score and a Clinical Global Impressions-Improvement [CGI-I] score of 1 or 2) at 12 weeks. The average reduction in YBOCS-rated symptoms for the whole group was 23.2%. None of the treated patients experienced symptom exacerbation or significant adverse effects. These results suggest that low-dose ondansetron may have promise as an augmentation strategy for some patients with OCD resistant to SSRIs and antipsychotic augmentation, but further controlled trials are required. Trial registration number (ClinicalTrials.gov): NCT00796497.
authors: Department of Psychiatry, Mount Sinai School of Medicine, New York, New York 10029, USA. stefano.pallanti@mssm.edu
authors: Stefano
authors: S
authors: Pallanti
authors: Silvia
authors: S
authors: Bernardi
authors: Sarah
authors: S
authors: Antonini
authors: Nikhilesh
authors: N
authors: Singh
authors: Eric
authors: E
authors: Hollander
mesh_terms: D000293:Adolescent; D000328:Adult; D014150:Antipsychotic Agents / Q000009:adverse effects / Q000627:therapeutic use; D004351:Drug Resistance; D004359:Drug Therapy, Combination; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009771:Obsessive-Compulsive Disorder / Q000188:drug therapy* / Q000503:physiopathology; D017294:Ondansetron / Q000009:adverse effects / Q000494:pharmacology / Q000627:therapeutic use*; D010865:Pilot Projects; D011569:Psychiatric Status Rating Scales; D058831:Serotonin 5-HT3 Receptor Antagonists; D012702:Serotonin Antagonists / Q000009:adverse effects / Q000494:pharmacology / Q000627:therapeutic use*; D017367:Selective Serotonin Reuptake Inhibitors / Q000009:adverse effects / Q000627:therapeutic use; D012720:Severity of Illness Index; D016037:Single-Blind Method; D055815:Young Adult
chemical_list: D014150:Antipsychotic Agents; D017294:Ondansetron; D058831:Serotonin 5-HT3 Receptor Antagonists; D012702:Serotonin Antagonists; D017367:Selective Serotonin Reuptake Inhibitors