WASHINGTON, Nov 4 (Reuters) - Two U.S. senators on Wednesday
launched a bipartisan investigation into pharmaceutical drug
pricing, requesting documents from four drugmakers, including
Valeant Pharmaceuticals (N:VRX) VRX.TO .
They also requested information from Turing Pharmaceuticals,
Retrophin Inc RTRX.O and Rodelis Therapeutics, Senators Susan
Collins and Claire McCaskill, who lead the Senate's Special
Committee on Aging, said in a statement.