The purpose of this study is to compare the 24-hour glucose profiles in diabetic patients treated with metformin following once daily and twice daily oral dosing

Inclusion Criteria:

• type II diabetes patients, female with non child-bearing potential
• Type 2 Diabetes Mellitus (T2DM) diagnosis confirmed by C-peptide >0.3nmol/L and no Glutamic acid decarboxylase (GAD) antibodies at enrolment (screening)
• Treatment with metformin as single therapy for T2DM for at least 30 days prior to enrolment and the metformin dose must have been unchanged during this period

Exclusion Criteria:

• History of ischemic heart disease, symptomatic heart failure, stroke, transitory ischemic attack or symptomatic peripheral vascular disease
• Any clinically significant abnormality identified on physical examination, laboratory test or ECG, which in the judgement of investigator would compromise the subject's safety or successful participation in the clinical study