International drug makers lead pharma stocks lower By: MarketWatch May 05, 2011 at 13:33 PM EDT Multinational drug makers dragged biotech stocks south as a series of lackluster earnings burdened sentiment. Read More >> Related Stocks: Bayer Aktienges ADR Celgene Corp Novartis Ag ADR Novo Nordisk A/S ADR Pfizer Roche Holding AG Basel American Depositary Shares Sanofi-Aventis S.A. ADR