State and federal lawmakers are working in tandem to get the controversial painkiller Zohydro ER permanently shelved, even as the head of the Food and Drug Administration defends the agency’s decision to approve the powerful opiate some critics call “heroin in a capsule.” Since its approval last October, Zohydro, an extended-release form of hydrocodone, has come under scrutiny from members of Congress, state attorneys general, doctors and addiction specialists who have worked to block the pill from being sold in the U.S. More