Pharmaceutical More than 30 groups representing consumer, labor and Medicare beneficiaries in the USA have joined a growing coalition urging Congress to support transparency requirements for pharmacy benefit managers (PBMs) in the health care reform proposals being considered by Congress. A total of 37 organizations wrote to Senate leaders to ask that Senator Maria Cantwell's (Democrat, Washington) amendment, approved by the Senate Finance Committee, be included in any final package voted on by the full Senate. 13 October 2009