HAYWARD, Calif.--(BUSINESS WIRE)--Impax Laboratories, Inc. (NASDAQ: IPXL) today announced that late Friday, June 3, it received a warning letter from the U.S. Food and Drug Administration (FDA) dated May 31, 2011 related to an on-site inspection of its Hayward, Calif. manufacturing facility conducted between December 13, 2010 and January 21, 2011.
