Byetta, Eli Lilly’s diabetes drug may be linked to a fatal form of pancreatitis, according to the FDA. The government agency is warning doctors and health professionals of the possible link. Byetta has been used by 70,000 patients since coming on the market. If you’re taking Byetta or have taken Byetta, you need to be aware of the symptoms of pancreatitis which include severe abdominal pain, nausea, vomiting, diarrhea, upper abdominal pain, and indigestion. The pain associated with pancreatitis is persistent and acute.