- Diagnosis of type 2 diabetes mellitus , currently treated with a sulfonylurea alone but experiencing inadequate glycemic control. Should have received the sulfonylurea monotherapy for at least the 3 months prior to Screening; has been on a stable sulfonylurea dose equivalent to at least 10 mg of glyburide (Exception: documented maximum tolerated dose equivalent to less than 10 mg but at least 5 mg glyburide) for at least 8 weeks.