High blood pressure, also known as hypertension, is one of the most common health problems around the world. In the United States alone, it affects nearly half of all adults.
Many people do not even know they have it because it often has no clear symptoms. Over time, however, high blood pressure can damage the heart, blood vessels, kidneys, and brain, leading to serious conditions such as heart attacks and strokes.
Blood pressure is measured using two numbers. The first number, called systolic pressure, shows how much force the blood puts on the artery walls when the heart pumps.
The second number, called diastolic pressure, measures the pressure when the heart is resting between beats. When these numbers are too high, treatment is needed to reduce the risk of long-term damage.
Most people rely on medication to manage high blood pressure. These medications are widely used and are usually effective. However, new research suggests that in some cases, the wrong medication choice can actually make blood pressure worse instead of better.
A study from Yeshiva University has found that certain blood pressure drugs can cause an unexpected reaction in some patients.
This reaction is known as a “pressor response,” which means the patient’s blood pressure increases rather than decreases after taking the medication. This finding is important because it challenges the common belief that these drugs always lower blood pressure.
The researchers focused on a factor in the body called renin. Renin is an enzyme produced by the kidneys, and it plays a key role in controlling blood pressure.
It helps regulate how the body balances fluids and how tightly blood vessels are constricted. Because of this, different people can have different levels of renin, and this can affect how they respond to certain medications.
The study suggests that a simple blood test to measure renin levels could help doctors choose the best treatment for each patient. By understanding a patient’s renin level, doctors may be able to avoid prescribing a drug that could have the opposite effect.
To explore this idea, the researchers analyzed data from 945 patients who had not previously been treated for high blood pressure. These patients were part of a workplace health program in New York City between 1981 and 1998. All participants had systolic blood pressure readings of at least 140 mmHg, which is considered high.
Each patient was given one of two types of medications. One group received what the researchers called “V drugs,” such as diuretics and calcium channel blockers.
These drugs work by reducing the amount of fluid in the body or relaxing blood vessels. The other group received “R drugs,” such as beta blockers and ACE inhibitors, which work by lowering renin levels.
The researchers measured each patient’s renin level and blood pressure at the start of the study. They then followed the patients for one to three months to see how their blood pressure changed after starting treatment.
The results showed a clear pattern. Patients with low renin levels who were given R drugs were much more likely to experience a pressor response. In these cases, their systolic blood pressure increased by 10 mmHg or more, which is a significant and potentially dangerous rise.
Overall, about 7.7% of all patients had this negative reaction. However, among patients with low renin levels who took R drugs, the rate was much higher, reaching 16%. This suggests that the mismatch between the type of medication and the patient’s renin level is a key factor in these unexpected outcomes.
In many cases, when a patient does not respond well to treatment, doctors may think it is due to random variation or that the patient is not taking the medication properly. This study shows that there may be another explanation: the treatment simply does not match the patient’s biological needs.
The researchers believe that using renin testing could help solve this problem. By identifying the most suitable medication from the start, doctors could improve treatment success and reduce the need for multiple drugs. This could also lower the risk of side effects and complications.
Two groups of patients may benefit the most from this approach. The first group includes people who are starting blood pressure treatment for the first time. The second group includes those who are already taking several medications but are not seeing good results.
The study was led by Michael Alderman and published in the American Journal of Hypertension. It highlights the importance of personalized medicine, where treatment is tailored to each individual rather than using a one-size-fits-all approach.
As renin testing becomes more available, it could change how doctors treat high blood pressure. Instead of guessing which medication might work best, they could use clear biological information to guide their decisions.
For patients, this research offers an important message. If treatment does not seem to be working, it may be worth discussing other options with a doctor. Understanding your body’s unique needs can lead to safer and more effective care.
If you care about high blood pressure, please read studies about unhealthy habits that may increase high blood pressure risk, and drinking green tea could help lower blood pressure.
For more information about high blood pressure, please see recent studies about what to eat or to avoid for high blood pressure, and 12 foods that lower blood pressure.
Copyright © 2026 Knowridge Science Report. All rights reserved.
