Nexium vs. Omeprazole

See how Nexium and Omeprazole compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Nexium and omeprazole are both proton pump inhibitors that treat GERD, heartburn, and ulcers by lowering stomach acid production.

  • Nexium is the active isomer of omeprazole, and the two drugs share overlapping side effects and similar effectiveness for most patients.

  • Generic omeprazole costs a fraction of brand-name Nexium, making it the more budget-friendly starting point for most people with GERD.

Nexium vs. Omeprazole Drug Summary

Nexium

Nexium (esomeprazole) is a proton pump inhibitor used to treat GERD, heal erosive esophagitis, and reduce ulcer risk from long-term NSAID use. It comes as a delayed-release capsule, an oral suspension, or an IV injection, and is usually taken once a day before eating.

Omeprazole

Omeprazole (Prilosec) is a proton pump inhibitor used to treat GERD, heartburn, and stomach or duodenal ulcers, including ulcers caused by H. pylori infection. It comes as a delayed-release capsule or oral suspension, and is typically taken once a day before a meal.

Nexium vs. Omeprazole Side Effects

Nexium

Most common
Headache (up to 5.5%)
Abdominal pain (up to 4%)
Diarrhea (up to 4%)
Nausea (>1%)

Omeprazole

Most common
Headache (up to 7%)
Abdominal pain (up to 5%)
Diarrhea (up to 4%)
Nausea (up to 4%)

Nexium vs. Omeprazole Dosage

Nexium

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 20 mg once daily At the start
Maximum dose 20 mg or 40 mg IV daily If needed
Dose changes 3 increases As tolerated

Omeprazole

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 20 mg once daily At the start
Maximum dose 40 mg once daily If needed
Dose changes 1 increase As tolerated

Nexium vs. Omeprazole Indications

Nexium

Nexium is FDA-approved to heal erosive esophagitis, treat short-term heartburn from GERD, and lower the risk of stomach ulcers caused by long-term NSAID use. It is also combined with antibiotics to eradicate H. pylori infection and used for rare acid-overproduction disorders like Zollinger-Ellison syndrome.

  • Healing and maintenance of erosive esophagitis

  • Short-term treatment of heartburn from GERD

  • Risk reduction of NSAID-related stomach ulcers

  • H. pylori eradication (with antibiotics)

  • Zollinger-Ellison syndrome and other hypersecretory conditions

Omeprazole

Omeprazole treats active duodenal and gastric ulcers, heals erosive esophagitis, and relieves heartburn from GERD. It is also combined with antibiotics to eradicate H. pylori and used for rare conditions that cause excess stomach acid, such as Zollinger-Ellison syndrome.

  • Treatment of active duodenal and gastric ulcers

  • Healing and maintenance of erosive esophagitis

  • Short-term treatment of GERD and heartburn

  • H. pylori eradication (with antibiotics)

  • Zollinger-Ellison syndrome and other hypersecretory conditions

Nexium vs. Omeprazole Pros and Cons

Nexium

Nexium offers an IV option for patients who cannot take oral medication and covers infants as young as 1 month for erosive esophagitis. As a brand-name drug, it typically costs more out of pocket than generic omeprazole, even though both work through the same acid-blocking mechanism.

Pros

  • Available as an IV injection for patients who cannot swallow pills

  • FDA-approved for infants as young as 1 month with erosive esophagitis

  • Available in both prescription and OTC strengths

Cons

  • Costs roughly $160 to $280 per month without insurance

  • Not approved for symptomatic GERD in infants under 1 year

  • No FDA-approved use for active duodenal or gastric ulcers

Omeprazole

Omeprazole has been available as a generic for decades, making it one of the most affordable PPIs on the market. It covers active duodenal and gastric ulcers, which Nexium's label does not, though it is not approved for infants under 1 year of age.

Pros

  • Generic version costs roughly $5 to $25 per month

  • FDA-approved for treating active duodenal and gastric ulcers

  • Approved for pediatric GERD treatment down to 1 year of age

Cons

  • No IV formulation for patients unable to take oral medication

  • Not approved for infants under 1 year of age

  • Requires twice-daily dosing for H. pylori triple therapy, unlike Nexium's once-daily regimen

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