Bristol-Myers Squibb Co. has been sued by two insurers that accuse it of overcharging for BuSpar, an anti-anxiety drug.
Mutual of Omaha Insurance Co. and Guardian Life Insurance Co. of America, which manage prescription-drug plans for companies, allege that the world's fifth-largest pharmaceutical company abused the patent process to block competition for BuSpar from 1995 to 2001.
