High blood pressure is one of the most common health problems worldwide.
It often causes no obvious symptoms, but over time it can damage blood vessels and raise the risk of heart attack, stroke, heart failure, kidney disease and other serious problems.
Medicines are widely used when lifestyle changes alone are not enough to bring blood pressure under control.
But researchers have also asked whether the time of day these medicines are taken could affect how well they work. One influential study from researchers at the University of Vigo and other institutions suggested that taking blood pressure medicine at bedtime might offer greater protection than taking it after waking.
The research involved more than 19,000 adults with high blood pressure. Participants were assigned to take all of their prescribed blood pressure medicines either when they woke up or at bedtime. Researchers followed them for an average of about six years and repeatedly measured their blood pressure, including during sleep.
The study found a large difference between the two groups. People assigned to bedtime treatment had better blood pressure control during sleep and were less likely to experience major heart and blood vessel problems.
Their risk of the combined outcome of heart-related death, heart attack, stroke, heart failure or a procedure to restore blood flow was about 45% lower.
The bedtime group also showed lower rates of several individual problems. The researchers reported about a 66% lower risk of death from heart or blood vessel disease, a 44% lower risk of heart attack and a 49% lower risk of stroke. Heart failure and procedures to restore blood flow to the heart were also less common.
One possible explanation involves the body’s natural daily rhythm. Blood pressure usually changes over 24 hours, rising during waking hours and falling during sleep. Some people with hypertension do not have the normal nighttime drop, and higher blood pressure during sleep has been linked with greater heart and blood vessel risk.
Taking medicine at bedtime could potentially improve blood pressure control during these sleeping hours. However, medication timing is not equally suitable for everyone. Some medicines can increase urination, for example, while some people may be at risk if their blood pressure falls too low during the night.
There is also an important reason for caution when interpreting this study. Its unusually large benefits attracted scientific debate, and later large clinical trials have not shown the same major advantage from routinely taking blood pressure medicines at night. This means the evidence does not support moving every patient to bedtime dosing simply on the basis of the earlier results.
For people with hypertension, the most important goal remains taking prescribed medicine consistently and keeping blood pressure under control. Patients should not change the timing or dose of their medication without discussing it with a doctor or pharmacist.
The best schedule can depend on the medicine, other health conditions, side effects and a person’s daily routine.
Healthy habits remain important as well. Regular physical activity, eating less salt, maintaining a healthy weight, avoiding smoking and limiting excess alcohol can all help manage blood pressure. These measures work alongside medication rather than replacing it for people who need drug treatment.
The University of Vigo research was published in the European Heart Journal as the Hygia Chronotherapy Trial. The study helped bring attention to the idea that the body’s daily clock may influence treatment, while later research has shown why medication timing needs to be studied carefully before broad recommendations are made.
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