The award came late Thursday evening in a case involving the drug Risperdal, a popular antipsychotic administered for the treatment of schizophrenia and bipolar disorder manufactured by Janssen, a division of Ortho-McNeil-Janssen Pharmaceuticals Inc., which is part of Johnson & Johnson. The jury, which has been hearing the case for almost two months, found the firm misled Louisiana doctors about the possible side effects of the drug.