Definitive data from a dedicated RCT addressing the CV safety question is lacking. Cardiovascular outcome Study of Linagliptin versus Glimipiride in Patients with Type 2 Diabetes (CAROLINA), an ongoing large head-to-head CV outcome trial comparing a SU (glimipiride) with a dipeptidyl peptidase-4 (DPP-4) inhibitor (linagliptin), will provide much needed information related to SU safety.