Long-term Safety and Efficacy of Empagliflozin as Add on to GLP-1 RA

Inclusion criteria: * Diagnosis of type 2 diabetes mellitus * Male and female patients on diet and exercise regimen who are pre-treated with Liraglutide at 0.9 mg/day alone for at least 10 weeks prior to screening must be \>=7.0% and \<=10.0% at screening * Male and female patients on diet and exercise regimen who are pre-treated with Liraglutide at 0.9 mg/day and one of oral antidiabetic drug (OAD) for at least 10 weeks prior to Visit 1 must be \>=7.0% and \<=9.0% at screening and \>=7.0% and \<=10.0% at placebo run-in * Male and female patients on diet and exercise regimen who are pre-treated with OAD alone for at least 10 weeks prior to Visit 1 must be \>=7.0% and \<=10.0% at both screening and placebo run-in * Age at informed consent must be \>=20 years * BMI at screening must be \<=40 kg/m2 * Further inclusion criteria apply Exclusion criteria: * Uncontrolled hyperglycaemia with a glucose values \>270 mg/dL (\>15.0 mmol/L) after an overnight fast during switch/washout/placebo run-in period and confirmed by a second measurement * Patients who are drug-naïve at screening visit or treat with any of insulin, thiazolidine dione, sodium-glucose co-transporter 2 (SGLT-2) inhibitor within 10 weeks prior to informed consent. * Acute coronary syndrome, stroke or transient ischemic attack within 12 weeks prior to informed consent * Indication of liver disease, defined by serum levels of either alanine aminotransferase, aspartate aminotransferase, or alkaline phosphatase above 3 x upper limit of normal as determined during screening and/or switch/washout/placebo run-in period * Impaired renal function, defined as estimated glomerular filtration rate (eGFR) \<45 mL/min/1.73m2 (Japanese equation) as determined during screening and/or switch/washout/placebo run-in period * Further exclusion criteria apply