Updates in treating comorbid bipolar disorder and obsessive-compulsive disorder: A systematic review

Background: In the last five years, the debate around the comorbidity between bipolar disorder (BD) and obsessive-compulsive disorder (OCD) has flourished within the international psychiatric community and several studies have been published on therapeutic strategies. Methods: An update of our previous systematic review was conducted on clinical management of comorbid BD–OCD patients. Relevant papers published from July 1st 2013 to September 30th 2018 were identified searching the electronic databases MEDLINE, Embase, PsycINFO and the Cochrane Library. Results: Fifteen studies were included. In all selected studies BD–OCD patients received mood stabilizers, alone or with second-generation antipsychotics (SGAs). Aripiprazole augmentation demonstrated to be effective as maintenance therapy and for treating obsessive-compulsive symptoms during manic episodes (40% of the studies, 6/15). Addition of antidepressants to mood stabilizers led to clinical remission of both conditions in only one case report. Limitations: Almost 50% of the selected studies are case reports. Enrolment of subjects mainly from outpatient specialty units might have introduced selection bias and limited community-wide generalizability. Conclusions: Mood stabilization should be the primary goal in treating BD–OCD patients. Aripiprazole augmentation to lithium carbonate seemed to be the best option in treatment-resistance comorbid patients. Addition of SRIs may be needed only in a minority of BD patients with refractory OCD.