Leaders of the Senate Special Committee on Aging today announced a bipartisan investigation into pharmaceutical drug pricing. Committee Chairman Susan Collins (R-ME) and Ranking Member Claire McCaskill (D-MO) have asked four pharmaceutical companies to provide information in relation to recent price increases in off-patent drugs: Valeant Pharmaceuticals, Turing Pharmaceuticals, Retrophin Inc and Rodelis Therapeutics. The committee has tentatively scheduled an initial hearing on the issue for Dec. 9.