TUESDAY May 10, 2016 — A popular over-the-counter heartburn medication accelerated aging of blood vessel cells in lab tests, raising red flags about its long-term effect on heart health, researchers say.

Faster aging of blood vessel cells exposed to the antacid Nexium(esomeprazole) might potentially hinder the tasks these cells perform to prevent heart attack and stroke, the new study suggests.

These lab results could explain why other studies have shown increased risk of heart disease in people who use proton pump inhibitors (PPIs) — the class of heartburn medication that includes Nexium, said study senior author Dr. John Cooke.

“Our finding that the lining of blood vessels is impaired by proton pump inhibitors is a unifying mechanism for the reports that PPI users are at increased risk for heart attack, stroke and renal failure,” said Cooke, chair of cardiovascular sciences at the Houston Methodist Research Institute.

However, many people aren’t using PPIs in accordance with FDA guidelines, which in Nexium’s case would limit them to a four-week course of treatment three times a year, Cooke said.

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