HEALTH

Martin Wygod Leaves Merck Unit: The pharmaceutical company announced the resignation of the chairman of Medco Containment Services Inc., the mail-order pharmaceutical and prescription benefit management firm that Merck bought for $6 billion. Wygod had been considered the leading contender to succeed Merck’s chairman and chief executive, Roy Vagelos, until last month, when Vagelos announced at Merck’s annual meeting that Wygod had told the board he did not want the job. Merck, based in Whitehouse Station, N.J., said Wygod will remain as a consultant for Medco under a multiyear contract. He will resign from Merck’s board.