The objective of this study is to examine the efficacy of Omacor® ( a mixture of omega-3-acid ethyl esters: eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) ) for BDP patients receiving CBT. Patients with BDP will be randomly allocated to the three arms of the study: 1- CBT+placebo, 2- CBT+Omacor 1680 mg/d, 3- CBT+Omacor 3360 mg/d. Follow up will last for 12 weeks. Assessment of affective symptoms, impulsivity and aggressivity will be carried out at baseline and at 2, 4, 6, 8, 10 and 12 weeks.