Patients with atherosclerotic cardiovascular disease and indication to start high intensity statin therapy will be recruited during hospital-stay or in the neurovascular outpatient clinic of the Neurology Department as well as in the Department of Cardiology and Vascular Medicine at the University Hospital Essen. Participants will be randomly allocated 1:1 to the intervention or control arm and all will receive a Low density Lipoprotein-Cholesterin (LDL-C) target and a statin-prescription as standard of care. All patients will be asked to take the prescribed statin in the evening and to provide LDL-C values measured by the family physician after 6 and 18 months. Additional blood will be collected after 6 and 18 months to control for cardiovascular risk-factors in the study center (LDL-C amongst others). In addition, the intervention group will receive free access to a study version of the medication management app mediteo m+ (Mediteo GmbH, Heidelberg). Installation of the app will be performed on the day of enrolment. After entering the medication, the app will remind the patient to take his or her statin therapy according to the therapy plan. Each intake has to be confirmed by the patient, either directly via the reminder notification or in the app. In addition, the app can be used to set reminders to go the family physician to take LDL-C values and to document the personal LDL-C values. The endpoint assessment will be performed in blinded manner.