Efficacy and Safety of Empagliflozin (BI 10773) / Linagliptin (BI 1356) Fixed Dose Combination in Treatment naïve and Metformin Treated Type 2 Diabetes Patients

Inclusion criteria: 1. Diagnosis of type 2 diabetes mellitus prior to informed consent 2. Male and female patients on diet and exercise regimen who are drug-naïve (defined as absence of any oral antidiabetic therapy, glucagon like peptide-1 analog or insulin for 12 weeks prior to randomization) or pre-treated with metformin (=1500 mg/day or on the maximum tolerated dose or the maximum dose according to local label) unchanged for 12 weeks prior to randomisation. 3. Glycosylated hemoglobin (HbA1c) = 7.0% and = 10.5% (= 53.0 mmol/mol and = 91.3 mmol/mol) at Visit 1 (screening) Exclusion criteria: 1. Uncontrolled hyperglycemia with a glucose level \>240 mg/dl (\>13.3 mmol/L) after an overnight fast during placebo run-in and confirmed by a second measurement (not on the same day). 2. Any other antidiabetic drug within 12 weeks prior to randomization (except metformin background therapy as defined via inclusion criterion 2) 3. Acute coronary syndrome (non-ST elevation myocardial infarction, ST elevation myocardial infarction and unstable angina pectoris), stroke or (transient ischemic attack) TIA within 3 months prior to informed consent