Inclusion Criteria:  Patients with the following inclusion criteria will be recruited:  is ≥18 years old; is diagnosed with arterial hypertension; is prescribed at least 1 antihypertensive medication; self-administers medication; is suspected of a deviant medication intake behavior (non-adherence) e.g., because of insufficiently controlled blood pressure in spite of prescribed pharmacotherapy (nonresponding); accepts to use of an electronic monitoring device during the study period (either the Time4Med™ device or the monitoring app busybee™); signs the informed consent form; understands and speaks German.  Patients who are using a pillbox, an app or reminders for medication management will not be excluded.  Exclusion Criteria:  Patients who are, in the opinion of the GP, unlikely to comply with the study schedule or are unsuitable for any other reason will be excluded.