The goal is to investigate in patients with high blood pressure, BP, namely, those with
systolic blood pressure and diastolic blood pressure, SBP/DBP higher than or equal to 140/90
mmHg, and high cardiovascular risk, under treatment with low-dose acetylsalicylic acid, ASA,
whether changing the time they take the drug (same dose) to bedtime (from taking it at some
point during the active part of the day) produces a drop in their blood pressure (mean
systolic and diastolic over 24 hours) of at least 2.5 mm Hg; and also whether among
non-dippers, under secondary treatment with low-dose ASA, there is be a greater decrease in
their night BP when the drug is taken in the evening.