Skipping blood pressure medication may greatly weaken heart protection

People who frequently missed blood pressure medication received far less cardiovascular protection in an analysis of more than 91,000 clinical trial participants. Those who followed their treatment more closely had fewer major problems involving the heart and blood vessels.

The results draw a clear line between a drug’s ability to work and the benefit patients actually get when doses are missed. The analysis was presented at ESC Congress 2026.

Researchers reviewed individual patient data from 91,339 participants in nine randomized clinical trials. Those studies compared blood pressure treatment with placebo or with less intensive treatment.

Participants were separated according to how consistently they took the medication they were assigned. People who took at least 80 percent of doses were considered to have higher adherence.

Even in the closely monitored setting of clinical trials, adherence slipped over time. During the first year, 88 percent of participants met the higher-adherence threshold.

By year five, that share had dropped to 79 percent, suggesting that staying on a regular routine becomes harder as treatment continues.

For a related approach to ongoing care, read about a home blood pressure program that may reduce stroke risk.

Among participants with higher adherence, systolic blood pressure was 5.2 millimeters of mercury lower in the treatment group than in the comparison group.

In the lower-adherence group, the difference was only 3.0 millimeters of mercury. Systolic pressure is the top number in a blood pressure reading.

The team also looked at major cardiovascular events, including heart attacks, strokes, heart failure, and related deaths or hospital admissions.

In the higher-adherence group, treatment was linked to an 11 percent lower rate of major cardiovascular events than the comparison treatment.

Among people with lower adherence, the researchers did not find a statistically significant reduction in these outcomes. That does not mean the drugs had no effect, but it does show that a clear benefit was not demonstrated in this group.

Because adherence was not randomly assigned, people who took their medication more regularly may have differed in other ways. Even so, the analysis used randomized trial data to examine the relationship.

The researchers said simpler treatment schedules and stronger support could help patients stay on track with their medication routines.

The findings show how everyday treatment habits can shape the benefits seen in clinical trials. They also reinforce the need to study medication use over years, not just in the early weeks of treatment.

Researchers added that missed doses can happen for many reasons, including complicated schedules and difficulties managing long-term treatment. Understanding those barriers may be just as important as finding effective drugs when health systems aim to cut preventable cardiovascular complications.

If you are interested in this topic, please read articles about Eating more plant-based proteins can lower blood pressure, study finds, and Fruits and vegetables can lower blood pressure and protect heart and kidneys.

For more information, please see articles about What should know about high blood pressure drugs and their side effects, and Breakfast for better blood pressure: what to eat to keep your heart happy.

Source: European Society of Cardiology and University of Oxford.