PPI for Reducing Stomach Acid and Frequent Heartburn Nexium 24HR Acid Reducer Heartburn Relief Capsules with Esomeprazole Magnesium block acid directly at the source to provide complete relief from frequent heartburn no matter what triggers it. Just one easy to swallow Nexium 24HR heartburn relief capsule a day provides complete all day all night protection from heartburn (1). Part of a group of medications called proton pump inhibitors (PPIs) Nexium 24HR capsules contain a delayed release formula with esomeprazole magnesium a stomach acid reducer to block acid at the source turning your body?s acid pumps from on to off for complete heartburn protection (2). Like other PPIs Nexium 24HR acid blocker capsules may take from 1 to 4 days to reach full effect but relief lasts for 24 hours letting you power through your day and sleep peacefully through the night without heartburn interruptions. Nexium 24HR is the number 1 selling OTC brand for frequent heartburn and the number 1 choice of doctors for thei