The Efficacy of Aripiprazole versus Risperidone as Augmentation Therapy in Treatment-Resistant Obsessive-Compulsive Disorder: A Double Blind Clinical Trial

Obsessive-compulsive disorder (OCD) is the fourth common psychiatric disorder. Among the anxiety disorders, OCD has the least therapeutic response and 40-60% of OCD patients do not satisfactorily respond to the first-line standard treatment known as treatment-resistant OCD. One of the best therapeutic strategies is the augmentation therapy, which is adding antipsychotics to the standard treatment (SSRIs).
In this study, the efficacy of risperidone and aripiprazole was compared as an augmentation therapy.
In this double blind randomized clinical trial, 100 patients with treatment-resistant OCD were diagnosed based on the DSM-IV-TR and were followed for twelve weeks. The patients were randomly divided into two groups of aripiprazole and risperidone and received an average daily dose of 5 mg and 1.5 mg for twelve weeks, respectively. The efficacy of treatment was measured and compared by the Yale-brown obsessive compulsive scale (Y-BOCS) at 4, 8 and 12 weeks.
The mean Y-BOCS score of patients in risperidone and aripiprazole groups were 25.26 ± 4.17 and 25.02 ± 4.46; respectively and had no significant difference (P = 0.79) at the beginning of the trial. At the end of the study (12th week) it was changed for the risperidone and aripiprazole groups to 20.00 ± 4.45 and 16.24 ± 4.41, respectively (P It was found that both aripiprazole and risperidone could be effective in treatment of treatment-resistant OCD patients. However, aripiprazole showed a higher efficacy compared to risperidone.