In a rare move, the Justice Department on Tuesday announced that it had charged a former vice president and top lawyer for the British drug giant GlaxoSmithKline with making false statements and obstructing a federal investigation into illegal marketing of the antidepressant Wellbutrin for weight loss. "This is absolutely precedent-setting this is really going to set people's hair on fire," said Douglas B. Farquhar, a Washington lawyer. "This is indicative of the F.D.A. and Justice strategy to go after the very top-ranking managing officials at regulated companies." The indictment accuses the Glaxo official, Lauren C. Stevens of Durham, N.C., of lying to the Food and Drug Administration in 2003, by writing letters, as associate general counsel, denying that doctors speaking at company events had promoted Wellbutrin for uses not approved by the agency. Ms. Stevens "made false statements and withheld documents she recognized as incriminating," including slides the F.D.A. had sought during its investigation, the indictment stated. The company was cooperating fully with a federal investigation into allegations of illegal sales and marketing of Wellbutrin. Last year, it set aside $400 million to resolve the case, which is still pending. Two weeks ago, in an unrelated case, GlaxoSmithKline agreed to pay $750 million to the government to settle civil and criminal complaints that it sold tainted or ineffective products from a large manufacturing facility in Puerto Rico.