As the proportion of elderly population increasing over the last years, polypharmacy and drug-drug interactions (DDI) has been a common health care problem. However, very limited epidemiologic data are available describing polypharmacy, potentially DDIs, and potentially inappropriate medications and their consequences in elderly Turkish patients. Therefore, this study will be performed to find out to prevalence of polypharmacy, inappropriate drug use and DDIs in elderly patients presenting to a outpatient cardiology clinics.