According to a Bloomberg.com report this week, Byetta® has more problems. The Food and Drug Administration has confirmed four more patients taking the type 2 diabetes drug Byetta® have died from pancreatitis.

That brings the drug-related fatalities to six in the last few months, though the FDA said no definite link between the additional deaths and Byetta® has been proven.

Federal regulators are working with Amylin Pharmaceuticals and Eli Lilly & Co. to develop a stronger warning label for the widely used drug. Regulators stress that patients who exhibit symptoms of pancreatitis should stop taking Byetta right away. Those symptoms include nausea, vomiting and abdominal pain. Regulators warn that it can be very difficult to tell the difference between acute and less dangerous forms of pancreatitis.

Already, a Virginia man has filed a defective drug lawsuit in a California court alleging Byetta’s manufacturers failed to adequately test and monitor the side effects, and didn’t warn doctors or patients of the risk of developing pancreatitis.