Eli Lilly and Co., which has faced thousands of lawsuits over its anti-psychotic Zyprexa, says lawyers’ ads about the drug are prompting some patients to stop taking mental illness medications when they shouldn’t.

The advertising blitz “presents yet another barrier for patients who suffer from severe mental illness” and increases the risks that people will not get the care they need, said Carole Puls, a spokeswoman for the Indianapolis-based drug maker.