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Heartburn

Esomeprazole

Proton pump inhibitor

Nexium
GERD, erosive oesophagitis, ulcers
Nexium 24HR
Frequent heartburn, as a 14-day course
FDA approved for heartburnGeneric availableAvailable over the counter

Nexium

Nexium 24HR

Each stripe is one section of the label, each division in a stripe one entry in that section.

Reference information, not medical advice

This page is a reference, not medical advice. It reports what the FDA-approved label states and links to that label. It does not tell anyone what to take, and it cannot replace a conversation with a doctor or pharmacist who knows the person's history.

Esomeprazole is sold as prescription Nexium and over the counter as Nexium 24HR. The prescription label runs from erosive oesophagitis and H. pylori eradication down to infants of one month; the shop label covers a 14-day course for adults with frequent heartburn.

01

Brands and what each one is approved for

One active ingredient can hold several separate FDA approvals. They are different documents with different approved uses, and mixing them up is the most common mistake made about these medications.

BrandWhat its label approvesSupplyLabel version
NexiumAstraZeneca Pharmaceuticals LPGERD, erosive oesophagitis, ulcersCovers heartburnPrescription19 December 2025
Nexium 24HRHaleon US Holdings LLCFrequent heartburn, as a 14-day courseCovers heartburnOver the counter19 March 2024
02

How it works

Written by us

The Nexium label states that esomeprazole is the S-isomer of omeprazole, which is the plainest available answer to why two products with different names contain what looks like the same medicine. That sentence appears in the pregnancy section, where the label uses data on omeprazole to reason about esomeprazole.

Mechanism of action, Nexium label

Esomeprazole belongs to a class of antisecretory compounds, the substituted benzimidazoles, that suppress gastric acid secretion by specific inhibition of the H+/K+ ATPase enzyme system at the secretory surface of the gastric parietal cell. Esomeprazole is protonated and converted in the acidic compartment of the parietal cell forming the active inhibitor, the achiral sulphenamide. Because this enzyme system is regarded as the acid (proton) pump within the gastric mucosa, esomeprazole has been characterized as a gastric acid-pump inhibitor, in that it blocks the final step of acid production.

03

What the FDA approved it for

From the FDA label

The approved uses, as worded in the label.

Nexium

  • Maintenance of healing of EE in adults.
  • Short-term treatment of heartburn and other symptoms associated GERD in adults and pediatric patients 12 years to 17 years of age.
  • Risk reduction of nonsteroidal anti-inflammatory drugs (NSAID)-associated gastric ulcer in adults at risk for developing gastric ulcers due to age (60 years and older) and/or documented history of gastric ulcers.
  • Helicobacter pylori eradication in adult patients to reduce the risk of duodenal ulcer recurrence in combination with amoxicillin and clarithromycin.
  • Long-term treatment of pathological hypersecretory conditions, including Zollinger-Ellison syndrome in adults. NEXIUM for delayed-release oral suspension is indicated for the:
  • Short-term treatment in the healing of EE in pediatric patients 1 year to 11 years of age and of EE due to acid-mediated GERD in pediatric patients 1 month to less than 1 year of age.

Nexium 24HR

  • Acid reducer
  • treats frequent heartburn (occurs 2 or more days a week)
  • not intended for immediate relief of heartburn; this drug may take 1 to 4 days for full effect
04

Forms and strengths

From the FDA label

The presentations and strengths listed in the label.

Nexium

  • Delayed-Release Capsules: 20 mg and 40 mg esomeprazole.
  • For Delayed-Release Oral Suspension: 2.5 mg, 5 mg, 10 mg, 20 mg, and 40 mg esomeprazole.

Nexium 24HR

Esomeprazole 20 mg (Each delayed-release capsule corresponds to 22.3 mg esomeprazole magnesium trihydrate)

05

How the label says it is taken

From the FDA label

What the label states about administration. It is not a dosing instruction for any individual.

Nexium

  • Population Recommended Adult and Pediatric Dosage Healing of EE (1 year and older) EE due to Acid-Mediated GERD (1 month to less than 1 year) Adults 20 mg or 40 mg A maximum dosage of 20 mg once daily is recommended for patients with severe liver impairment (Child-Pugh Class C). once daily for 4 to 8 weeks;
  • Swallow capsules whole; do not crush or chew. For patients who cannot swallow intact capsule, the capsule can be opened, and the contents mixed with applesauce.
  • Mix packets with water to create an oral suspension.
  • Opened capsules can be administered through a nasogastric tube and oral suspension can be administered through a nasogastric or gastric tube. Recommended Dosage in Adults by Indication Table 1 shows the recommended adult dosage of NEXIUM by indication.

Nexium 24HR

  • adults 18 years of age and older
  • this product is to be used once a day (every 24 hours), every day for 14 days
  • may take 1 to 4 days for full effect 14-Day Course of Treatment Repeated 14-Day Courses (if needed) swallow 1 capsule with a glass of water before eating in the morning
  • take every day for 14 days
  • do not take more than 1 capsule a day
  • swallow whole. Do not crush or chew capsules.
  • do not use for more than 14 days unless directed by your doctor
  • you may repeat a 14-day course every 4 months
  • do not take for more than 14 days or more often than every 4 months unless directed by a doctor
  • children under 18 years of age: ask a doctor before use. Heartburn in children may sometimes be caused by a serious condition.
06

Most common adverse reactions

From the FDA label

The adverse reactions the label reports as most common.

Nexium

  • Most common adverse reactions: • Adults (≥ 18 years) (> 1%) are: headache, diarrhea, nausea, flatulence, abdominal pain, constipation, and dry mouth.
  • most common adverse reactions that were reported were: diarrhea (4%), headache (4%), and abdominal pain (4%).

Nexium 24HR

  • your heartburn continues or worsens
  • you need to take this product for more than 14 days
  • you need to take more than 1 course of treatment every 4 months
  • you get diarrhea
  • you develop a rash or joint pain
07

Warnings and precautions

From the FDA label

The warnings and precautions section of the label.

Nexium

  • Gastric Malignancy: In adults, symptomatic response does not preclude the presence of gastric malignancy. Consider additional follow-up and diagnostic testing.
  • Acute Tubulointerstitial Nephritis: Discontinue treatment and evaluate patients.
  • Clostridium difficile- Associated Diarrhea: PPI therapy may be associated with increased risk.
  • Bone Fracture: Long-term and multiple daily dose PPI therapy may be associated with an increased risk for osteoporosis-related fractures of the hip, wrist or spine.
  • Severe Cutaneous Adverse Reactions: Discontinue at the first signs or symptoms of severe cutaneous adverse reactions or other signs of hypersensitivity and consider further evaluation.
  • Cutaneous and Systemic Lupus Erythematosus: Mostly cutaneous; new onset or exacerbation of existing disease; discontinue NEXIUM and refer to specialist for evaluation.
  • Interaction with Clopidogrel: Avoid concomitant use of NEXIUM.
  • Cyanocobalamin (Vitamin B-12) Deficiency: Daily long-term use (e.g., longer than 3 years) may lead to malabsorption or a deficiency of cyanocobalamin.

Nexium 24HR

  • had heartburn over 3 months. This may be a sign of a more serious condition.
  • frequent wheezing, particularly with heartburn
  • unexplained weight loss
  • nausea or vomiting
  • stomach pain
08

Contraindications

From the FDA label

Situations in which the label states the medication must not be used.

Nexium

  • Known hypersensitivity to substituted benzimidazoles or any component of the formulation.
  • Patients receiving rilpivirine-containing products.
  • Refer to the Contraindications section of the prescribing information for amoxicillin and clarithromycin, when administered in combination with NEXIUM.

Nexium 24HR

  • trouble or pain swallowing food, vomiting with blood, or bloody or black stools
  • heartburn with lightheadedness, sweating or dizziness
  • chest pain or shoulder pain with shortness of breath; sweating; pain spreading to arms, neck or shoulders; or lightheadedness
  • frequent chest pain
09

Drug interactions

From the FDA label

Interactions the label singles out.

Nexium

There are other antiretroviral drugs which do not result in clinically relevant interactions with esomeprazole. Intervention: Rilpivirine-containing products: Concomitant use with NEXIUM is contraindicated. Atazanavir: See prescribing information for atazanavir for dosing information. Nelfinavir: Avoid concomitant use with NEXIUM. See prescribing information for nelfinavir.

10

Pregnancy and breastfeeding

From the FDA label

The opening of the pregnancy section of the label. The full section is longer and is in the source document.

Nexium

There are no adequate and well-controlled studies with esomeprazole in pregnant women. Esomeprazole is the S-isomer of omeprazole. Available epidemiologic data fail to demonstrate an increased risk of major congenital malformations or other adverse pregnancy outcomes with first trimester omeprazole use (see Data).

Nexium 24HR

If pregnant or breast-feeding, ask a health professional before use.

11

Generic or brand

Written by us

Generic esomeprazole magnesium is approved and available on prescription, and store-brand versions of the over-the-counter product exist as well.

The FDA label database lists 39 approved generic applications for this ingredient.

12

What affects the cost

Written by us

Branded Nexium and generic esomeprazole differ in price, and the over-the-counter version is priced as a consumer product rather than a prescription. No label discusses cost.

13

What pharmacies pay for it

From CMS pricing data

These are acquisition costs: what pharmacies in the United States pay on average to buy the medication, published weekly by the Centers for Medicare and Medicaid Services. They are not retail prices and not what a person pays at the counter, which depends on insurance, pharmacy and discount programmes. They are useful as an objective floor and for seeing how far a brand sits above its generic.

MeasuredBrandGeneric
per tablet, capsule or pen$9.14 (range $8.77 to $9.18, 270 listings)$0.163 (range $0.120 to $6.98, 3411 listings)

Median of 3681 listings. Effective dates 2025-04-23 to 2026-07-22, file dated 2026-07-29.

14

Compared with other medications

What the labels do not do is compare one medication against another. These pages put two of them side by side.

15

Common questions

Written by us
What is the difference between Nexium and Nexium 24HR?
They are two separate FDA approvals for the same active ingredient. Nexium is a prescription medicine for conditions including erosive oesophagitis, GERD and ulcer risk reduction, in patients down to one month of age. Nexium 24HR is an over-the-counter 20 mg capsule for adults, taken once daily for 14 days against frequent heartburn.
Is esomeprazole stronger than omeprazole?
The labels do not compare them, and this page does not rank them. What the Nexium label does state is that esomeprazole is the S-isomer of omeprazole. Both over-the-counter products are 20 mg once daily for 14 days.
16

Other medications under heartburn

Whether each one carries an FDA approval for this use is marked on its page and in this list.

17

Sources

Every fact above comes from one of these documents. The date is the effective date of the label version this page was built from.

Page last updated: 11 August 2026

Compiled by the HealthyStudy editorial team from FDA source documents. No medical reviewer is credited on this page, because none reviewed it.