ZYPREXA IntraMuscular is an injectable form of ZYPREXA that is approved for the treatment of agitation in people with schizophrenia or bipolar mania. Because it is an injectable medication, ZYPREXA IntraMuscular is faster acting than ZYPREXA tablets. After short-term treatment with ZYPREXA IntraMuscular, a person may receive a prescription for ZYPREXA tablets for maintenance treatment in schizophrenia or bipolar disorder, if clinically indicated.