Antidepressants have propensity to induce manic switch in patients with bipolar disorder. Opipramol is an atypical anxiolytic and antidepressant drug which predominantly acts on sigma receptors. Although structurally resembles tricyclic antidepressant imipramine it does not have inhibitory action on the reuptake of norepinephrine/serotonin and hence it is not presumed to cause manic switch in bipolar depression. Here, we describe a case of mania induced by opipramol, in a patient with bipolar affective disorder who was treated for moderate depressive episode with lithium and opipramol and we discuss neurochemical hypothesis of opipramol-induced mania.