Federal health regulators have approved an attention deficit disorder drug for a new use: A first-of-its kind treatment for binge-eating disorder. […] The Food and Drug Administration originally approved Vyvanse in 2007 as a once-a-day pill for attention deficit hyperactivity disorder. On Friday, the agency cleared the drug for adults who compulsively overeat. Vyvanse, known chemically as lisdexamfetamine dimesylate, is part of a family of drugs that stimulate the central nervous system. The drug’s prescribing label warns that Vyvanse has a “high potential for abuse and dependence,” and doctors should monitor patients for signs of dependence. …