What Is Nexium? Uses, Dosage, and What You Need to Know in 2026

Nexium Is a Proton Pump Inhibitor Used to Treat GERD, Acid Reflux, and Stomach Ulcers

Nexium (Esomeprazole Magnesium) is a proton pump inhibitor (PPI) that reduces stomach acid production to treat conditions like gastroesophageal reflux disease (GERD), erosive esophagitis, and stomach ulcers.

If your doctor prescribed Nexium — or you're considering the over-the-counter version — this guide covers everything you need to know: what it is, what it treats, how to take it, who shouldn't use it, and what it costs in 2026.

What Is Nexium?

Nexium is the brand name for Esomeprazole Magnesium, a medication in the proton pump inhibitor (PPI) class. It was developed and manufactured by AstraZeneca and received FDA approval for the treatment of GERD and related acid conditions.

Esomeprazole is technically the S-isomer of Omeprazole (the active ingredient in Prilosec), which gives it a slightly different metabolic profile. In practical terms, both medications work very similarly, but Esomeprazole may offer more consistent acid suppression in some patients.

Nexium is available in several forms:

• Prescription delayed-release capsules: 20 mg and 40 mg
• Prescription oral suspension packets: 2.5 mg, 5 mg, 10 mg, 20 mg, and 40 mg
• Prescription IV injection: 20 mg and 40 mg vials (hospital use)
• OTC delayed-release capsules and tablets: 20 mg (sold as Nexium 24HR)

Nexium is not a controlled substance. You may also see it called Esomeprazole, Esomeprazole Magnesium, Esomeprazole Sodium, or "The Purple Pill."

What Is Nexium Used For?

Nexium is FDA-approved for the following conditions:

Gastroesophageal Reflux Disease (GERD)

GERD is the most common reason Nexium is prescribed. It treats heartburn and other symptoms of acid reflux in adults and children 1 year and older. For most patients, Nexium is taken for 4–8 weeks to control symptoms.

Erosive Esophagitis

When stomach acid repeatedly damages the lining of the esophagus, it causes erosive esophagitis. Nexium is approved for short-term healing in adults and children as young as 1 month, and for maintenance therapy to prevent recurrence in adults.

H. pylori Eradication

In combination with antibiotics Amoxicillin and Clarithromycin ("triple therapy"), Nexium helps eradicate Helicobacter pylori bacteria to reduce the risk of duodenal ulcer recurrence.

NSAID-Associated Gastric Ulcer Prevention

For adults at risk of stomach ulcers from NSAIDs (such as those age 60+ or with a history of gastric ulcers), Nexium reduces that risk while allowing continued NSAID use.

Zollinger-Ellison Syndrome

This rare condition causes the stomach to produce excessive acid. Nexium is used for long-term management, sometimes at higher doses (up to 40 mg twice daily).

OTC Use: Frequent Heartburn

Nexium 24HR (20 mg OTC) is approved for adults who experience heartburn 2 or more days per week. The OTC regimen is 20 mg once daily for 14 days, which can be repeated every 4 months if needed.

Off-Label Uses

Doctors sometimes prescribe Nexium off-label for functional dyspepsia, Barrett's esophagus surveillance, stress ulcer prevention in ICU patients, laryngopharyngeal reflux (LPR or "silent reflux"), and as part of eosinophilic esophagitis treatment.

How Is Nexium Taken?

Here's how to take Nexium for best results:

• Timing: Take at least 1 hour before a meal, typically in the morning before breakfast.
• How to swallow: Take capsules whole with a full glass of water. Do not crush, chew, or break the capsule.
• If you can't swallow capsules: Open the capsule and sprinkle the contents onto a spoonful of applesauce. Swallow immediately without chewing the granules.
• Typical prescription dose: 20 mg to 40 mg once daily for 4–8 weeks, depending on the condition being treated.
• Zollinger-Ellison dose: Up to 40 mg twice daily.
• OTC dose: 20 mg once daily for 14 days. Do not use for more than 14 days unless directed by a doctor.

Consistency matters — take Nexium at the same time each day for the best acid suppression.

Who Should Not Take Nexium?

Nexium is not right for everyone. You should not take Nexium if you have:

• Known allergy to Esomeprazole or other PPIs — If you've had an allergic reaction to Omeprazole, Lansoprazole, Pantoprazole, or any substituted benzimidazole, Nexium may cause a similar reaction.
• Taking Rilpivirine-containing HIV medications — Nexium is contraindicated with Rilpivirine (found in Edurant, Complera, Odefsey, and Cabenuva) because it significantly reduces Rilpivirine levels, potentially causing HIV treatment failure.

Use with caution if you have severe liver disease (maximum dose 20 mg daily) or are pregnant or breastfeeding (use only if clearly needed — Esomeprazole is present in breast milk).

Always tell your doctor about all medications you take, including over-the-counter drugs and supplements. For a detailed list of interactions, see our guide on Nexium drug interactions.

How Much Does Nexium Cost?

The cost of Nexium in 2026 depends on whether you're getting the brand name, generic, or OTC version:

• Brand-name Nexium (Rx): $280–$450 for 30 capsules (40 mg) at retail price.
• Generic Esomeprazole (Rx): $11–$25 for 30 capsules with a GoodRx or SingleCare discount coupon. Without a coupon, expect $40–$120.
• OTC Nexium 24HR: $18–$25 for a 14 to 42 count package at most drugstores and grocery stores.

Generic Esomeprazole is covered by most insurance plans, typically on Tier 1 or Tier 2 formularies. Brand Nexium may require prior authorization or step therapy (trying generic first).

AstraZeneca offers a Nexium Savings Card for commercially insured patients at purplepill.com, bringing the cost to as low as $15–$18 per fill. For uninsured patients, AstraZeneca's AZ&Me program provides Nexium at no cost for qualifying individuals.

For a complete breakdown of savings options, see our guide: How to Save Money on Nexium.

Final Thoughts

Nexium is a well-established, effective medication for managing acid reflux, GERD, erosive esophagitis, and other conditions where stomach acid causes problems. For most patients, the generic version (Esomeprazole) is affordable and widely available.

The key points to remember:

• Take it 1 hour before eating for best results
• Don't use the OTC version for more than 14 days without talking to a doctor
• Watch for side effects with long-term use
• Generic is just as effective and much cheaper

If you're looking for a pharmacy that has Nexium in stock, Medfinder can help you find one near you. And if Nexium doesn't work for you, check out our guide on alternatives to Nexium.