Zyprexa (olanzapine) is an atypical antipsychotic approved in the United States for the treatment of bipolar disorder and schizophrenia. It is also prescribed by some doctors for off-label uses, with no documented proof of effectiveness.
Some patients claim that Eli Lilly, the manufacturer of Zyprexa, did not properly warn patients about the potential side effects that can occur while taking this medication. It has been alleged that Zyprexa can actually cause diabetes and other illnesses. At the very least it appears that the drug can lead to non-trivial hyperglycemia in patients that already have diabetes.