- Patients with type 2 diabetes mellitus who are taking either no medication for the treatment of diabetes (diet/exercise therapy only), or who are taking only a single oral anti-diabetic drug (OAD) that can be temporarily discontinued for approximately 8-10 weeks. For those taking a single OAD, treatment should be stable, where this is defined as no change in the treatment, including dose, over the past 3 months prior to Screening. OAD medications that are acceptable to be discontinued include: a sulfonylurea (SU), a meglitinide, a biguanide (eg, metformin), a dipeptidyl peptidase 4 inhibitor (DPP-4i), or an alpha glucosidase inhibitor.