Study to Evaluate the Effect of BYDUREON on 24-hour Glucose Control in Metformin treated Patients with Type 2 Diabetes.

Exclusion Criteria

• -History of taking antihyperglycemic therapy other than metformin or metformin extended release (XR) during the 8 weeks prior to screening
• -History of taking a dipeptidyl peptidase-4 (DPP-4) inhibitor or pramlintide during 12 weeks prior to screening
• -History of potent, inhaled or intrapulmonary steroids 3 months prior to screening or during the study
• -History of prescription or over the counter weight loss medication during 3 months prior to screening
• -Previous exposure to exenatide or any glucagon-like peptide-1 (GLP-1) receptor agonist during 6 months prior to screening