WASHINGTON - Type 2 diabetics got a new option to help control their blood sugar Friday, a drug derived from the saliva of the Gila monster — but one that must be injected twice a day. The Food and Drug Administration approved Byetta, known chemically as exenatide, the first in a new class of medications for Type 2 diabetes — but for now, it's supposed to be used together with older diabetes drugs, not alone. Makers Amylin Pharmaceuticals and Eli Lilly & Co. said the prescription drug would begin selling by June 1, but wouldn't provide a price. Some 18...