Lilly Makes Billions Off Zyprexa While Approved for Schizophrenia Only. For the first four years that Zyprexa was sold in the US, the promotion of the drug for any use other than adult schizophrenia was illegal. When the FDA approves a drug for a specific use, it can only be marketed for that use. Eli Lilly gained approval for schizophrenia in 1996 and the drug was not approved to treat bipolar disorder until 2000.