* The study aims to assess the efficacy and tolerability of risperidone added to lithium, valproate or lamotrigine, or any combination of the three, in patients experiencing a manic episode with depressive or irritable symptoms.
* To assess the back ground and baseline features associated with response/non-response to risperidone plus mood stabilizer in patients with mania with depressive or irritable features.
* To assess the symptomatic dimensions of response of risperidone added to mood stabilizers in patients with mania with depressive or irritable features.
