a) Current use of the following medications for the treatment of diabetes, or use within the specified timeframe prior to screening for the study: i) Six months: insulin. ii) Four months: thiazolidinediones. iii) Two months: any other antidiabetic treatment iv) Any previous use of DPP4-inhibitor and/or incretin mimetics b) Current use of prescription or non-prescription weight loss drugs and their use within 3 months of screening.