US investigate pharmacy benefit deals

The US Attorney's Office is investigating contracts between drugmakers and companies that manage prescription benefits, according to regulatory filings.

Federal prosecutors have approached at least three companies, including Johnson & Johnson, Merck & Co and Endo International, demanding information about their contracts with pharmacy benefit managers.

Pharmacy benefit managers, or PBMs, which administer drug benefits for employers and health plans and also run large mail-order pharmacies, have been