Medicines that lower blood pressure have helped millions of people reduce their risk of heart attack, stroke, and other serious health problems.
These medicines are generally considered safe and effective when they are used as directed by a doctor. Even so, researchers continue to study them because uncommon side effects may only become clear after many years of use.
A new study from the European Sudden Cardiac Arrest network has raised questions about one commonly prescribed medicine. The researchers found that people taking high doses of nifedipine may have a greater risk of sudden cardiac arrest. The study was published in the European Heart Journal.
Sudden cardiac arrest is a medical emergency that happens when the heart suddenly stops pumping blood around the body. Without immediate treatment, the brain and other organs quickly lose oxygen, and death can occur within minutes. In Europe, sudden cardiac arrest accounts for about half of all heart-related deaths and around one in five natural deaths.
Doctors often prescribe medicines called calcium channel blockers to treat high blood pressure and chest pain caused by reduced blood flow to the heart. Two well-known medicines in this group are nifedipine and amlodipine. Both have been used for many years and have helped many patients control their condition.
In this study, the researchers compared health records from thousands of people who experienced sudden cardiac arrest with records from healthy individuals. They wanted to find out whether either medicine was linked to a higher risk of this serious event.
The results showed that people taking high doses of nifedipine had a greater chance of sudden cardiac arrest. In contrast, the researchers did not find the same increased risk among people taking amlodipine. This difference surprised the research team because both medicines belong to the same drug family.
The findings do not prove that nifedipine directly causes sudden cardiac arrest. The study found an association, which means the two were linked but one was not proven to cause the other. More research is needed to confirm the results and understand why this possible risk exists.
People who take nifedipine should not stop taking their medicine without first speaking to their doctor. Suddenly stopping blood pressure medicine can be dangerous. Anyone who develops symptoms such as chest pain, shortness of breath, fainting, or severe nausea should seek medical care immediately because these symptoms may signal a serious heart problem.
For doctors, the study suggests that high-dose nifedipine should be prescribed with extra care, especially for patients who already have heart disease or other risk factors. In some cases, another medicine or a lower dose may be a safer choice, depending on the patient’s overall health.
This research highlights why long-term safety studies remain important even for medicines that have been available for decades. As scientists learn more about sudden cardiac arrest, they hope to identify people at highest risk and improve treatment decisions.
These findings may eventually help doctors choose the safest medicines for each patient while continuing to control high blood pressure effectively.
If you care about high blood pressure, please read studies that early time-restricted eating could help improve blood pressure, and natural coconut sugar could help reduce blood pressure and artery stiffness.
For more health information, please see recent studies about added sugar in your diet linked to higher blood pressure, and results showing vitamin D could improve blood pressure in people with diabetes.
Copyright © 2026 Knowridge Science Report. All rights reserved.
