The ADAMPA study is a pragmatic randomized clinical trial which aims to evaluate the effectiveness of an intervention based on self-monitoring and self-titration of medication in poorly controlled hypertensive patients 40 years and older. The total duration of the study is 3 years, with 6 months of enrolment and 1 year of follow-up to measure the primary endpoint (Difference in mean systolic blood pressure, in mmHg, between the intervention and control groups).