That stinging sensation in the chest may be more than just heartburn for those taking certain antacids.

A new study by researchers at Houston Methodist and Stanford University shows that a category of drugs commonly used to fight acid reflux, called proton pump inhibitors, may raise the risk of heart attack. Proton pump inhibitors include such well-known brands such as Prilosec, Nexium, Prevacid and others.

"Proton pump inhibitors increase the risk of heart attack in the general population by about 15 to 20 percent," Dr. John Cooke of Houston Methodist Research Institute told CBS News.

In the study, which examined anonymous, electronic medical records from 2.9 million patients, researchers found a clear association between proton pump inhibitors (PPIs) and heart attack. Analysis of patients using another type of antacid drugs called H2 blockers, such as Zantac, Tagament or Pepcid, did not show this increased risk.

Common heartburn drugs could raise risk of heart attacksMillions of people take drugs known as proton pump inhibitors (PPIs) to treat heartburn and acid reflux. Popular brands include Prilosec, Prevacid and Nexium. But now a new study raises concern that they may increase the risk of heart attacks. Brian Webb reports.

Read the full report here.