Improvement in depression associated with partial epilepsy in patients treated with lamotrigine.

Interictal depression is common in patients with epilepsy and it significantly impacts quality of life. Previous studies indicate that lamotrigine may have antidepressant properties. Thirteen adults with uncontrolled partial seizures and concomitant depression were evaluated using measures of depression [Montgomery and Asberg Depression Rating Scale (MADRS) and the MMPI Depression Scale] and anxiety [Spielberger's State-Trait Anxiety Inventory (STAI)] to test the effects of lamotrigine on mood. Evaluations after 5 weeks and again after 3 months of lamotrigine treatment demonstrated significant improvement in depression and anxiety. Mean MADRS overall scores were significantly lower than pretreatment baseline at the 5-week and 3-month evaluations. The mean MMPI Depression score was significantly lower than baseline at the 3-month evaluation. State anxiety scores were significantly reduced from baseline after 5 weeks, but not at 3 months, whereas Trait anxiety scores were reduced from baseline at the 5-week and 3-month evaluations.