The EPIC (Epidemiology of Polipharmacy and Potential Drug-Drug Interactions in Elderly Cardiac Outpatients) study will be the first large-scale, observational, real-world multicenter study to evaluate DDIs ve polypharmacy in elderly cardiac outpatients conducted in Turkey. We will enroll all consecutive patients (aged≥ 65 years) admitted to the outpatient cardiology clinics from January 30, 2018, through June 30, 2018, provided written informed consent. Approximately 5000 patients will be enrolled in this non-interventional study. All the data will be collected at one point in time and current clinical practice will be evaluated.