By Brendan Pierson

Law360, New York (September 15, 2009, 4:32 PM ET) -- The U.S. government has fired back at Wyeth's bid to dismiss a consolidated whistleblower suit that accuses the drugmaker of overcharging state Medicaid programs hundreds of millions of dollars for acid reflux treatment Protonix, claiming Wyeth misstated facts and concocted tortured after-the-fact justifications for the fraud.

In a memorandum in opposition to Wyeth's motion to dismiss, filed Monday in the U.S. District Court for the District of Massachusetts, the federal government contended that Wyeth falsely claimed that it never enforced bundling agreements to give non-Medicaid customers...