Sen. Charles E. Grassley (R-Iowa) said he had asked Amgen Inc. to "account for notably high rebates" the company had offered physicians for prescribing Aranesp, an anemia drug.
Thousand Oaks-based Amgen paid almost $800 million in rebates to 6,000 facilities, including physician groups, in 2006, Grassley said, citing company data. Doctors collected payments from Medicare and insurers that exceeded the price they paid for the drugs, he said.
