title: 8-week, single-blind, randomized trial comparing risperidone versus olanzapine augmentation of serotonin reuptake inhibitors in treatment-resistant obsessive-compulsive disorder.
abstract: The aim of the present pilot study was to investigate in a single-blind manner, over a period of 8 weeks, the comparative efficacy and tolerability of risperidone versus olanzapine addition in the treatment of OCD patients who did not show a >or=35% decrease in the YBOCS score after 16-week SRI treatment (defined as resistant). The study consisted of two different phases: a 16-week open-label prospective phase to ascertain resistance to SRI treatment and an 8-week single-blind addition phase for resistant subjects only. Ninety-six subjects with DSM-IV OCD (YBOCS>or=16) entered the open-label prospective phase; at the end of the 16-week period, 50 (52%) were judged to be resistant and were randomized to receive risperidone (1 to 3 mg/d) or olanzapine (2.5 to 10 mg/d) addition for 8 weeks. Overall, patients in both groups responded significantly, without differences between the two treatment groups; although no differences emerged for the proportion of patients reporting at least an adverse event, the profiles of adverse experiences differed significantly, being risperidone associated with amenorrhoea and olanzapine with weight gain.
authors.affiliation: Department of Neurosciences, Mood and Anxiety Disorders Unit, University of Turin, Italy. giuseppemaina@hotmail.com
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Maina
authors.forename: Enrico
authors.initials: E
authors.lastname: Pessina
authors.forename: Umberto
authors.initials: U
authors.lastname: Albert
authors.forename: Filippo
authors.initials: F
authors.lastname: Bogetto
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D014150:Antipsychotic Agents / Q000627:therapeutic use*; D001569:Benzodiazepines / Q000627:therapeutic use*; D004305:Dose-Response Relationship, Drug; D004341:Drug Evaluation; D004357:Drug Synergism; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009771:Obsessive-Compulsive Disorder / Q000188:drug therapy*; D000077152:Olanzapine; D011446:Prospective Studies; D018967:Risperidone / Q000627:therapeutic use*; D016037:Single-Blind Method; D013997:Time Factors
chemical_list: D014150:Antipsychotic Agents; D001569:Benzodiazepines; D018967:Risperidone; D000077152:Olanzapine