Drugs known as beta-blockers are commonly prescribed to people who want to lower their blood pressure – however, new research suggests they may actually contribute to heart problems.

A study carried out at Columbia University looked at data related to more than 34,000 people who had begun taking beta-blockers following non-cardiac surgery in an attempt to lower their blood pressure.

They compared the information with that from patients who were given other medications to combat hypertension, as well as those taking a placebo.

The researchers, led by Dr. Frank H. Messerli, found that people taking beta-blockers had a higher risk of heart attack, stroke and death.

“Our study adds to the controversy regarding the optimal use of perioperative beta-blockers in patient populations at various levels of cardiac risk,” the authors wrote.

Beta-blockers are used to block the effects of epinephrine, a hormone also known as adrenaline, which causes the heart to beat more slowly.

Some people have also found oral chelation to be an effective way to lower their blood pressure naturally.