Is Nexium better than Prilosec?

Neither label makes that comparison and this page does not rank them. Their over-the-counter instructions are nearly identical: 20 mg once daily, adults 18 and over, a 14-day course for frequent heartburn.

Can they be taken together?

Neither label describes taking two acid reducers at once. Both direct anyone whose heartburn continues past 14 days to a doctor rather than to a second product.

Comparison

Prilosec OTC vs Nexium 24HR

Prilosec OTC

OMEPRAZOLE MAGNESIUM

Approved forFrequent heartburn, as a 14-day course

Covers heartburn

The Procter & Gamble Manufacturing CompanyLabel version 17, effective 1 October 2025

Nexium 24HR

ESOMEPRAZOLE MAGNESIUM

Approved forFrequent heartburn, as a 14-day course

Covers heartburn

Haleon US Holdings LLCLabel version 30, effective 19 March 2024

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.

These are the two best known heartburn products sold without a prescription in the United States. They contain different but closely related molecules, and their labels authorise almost exactly the same thing.

Side by side, straight from the labels

From the FDA label

This table is generated from the two source labels, not typed out by hand, so it cannot drift from what the regulator approved.

Label section	Prilosec OTCOMEPRAZOLE MAGNESIUM	Nexium 24HRESOMEPRAZOLE MAGNESIUM
Active ingredient	OmeprazoleProton pump inhibitor	EsomeprazoleProton pump inhibitor
Approved for	Frequent heartburn, as a 14-day course	Frequent heartburn, as a 14-day course
Supply	Over the counter	Over the counter
What pharmacies payAcquisition cost, not retail	$14.78 per tablet, capsule or pen, brand	not listed
Boxed warning	None	None
What this product is for	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	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
Active ingredient (in each tablet)	Omeprazole delayed-release tablet 20 mg (equivalent to 20.6 mg omeprazole magnesium)	Esomeprazole 20 mg (Each delayed-release capsule corresponds to 22.3 mg esomeprazole magnesium trihydrate)
Directions	for adults 18 years of age and older this product is to be used once a day (every 24 hours), every day for 14 days it may take 1 to 4 days for full effect; some people get complete relief of symptoms within 24 hours 14-Day Course of Treatment swallow 1 tablet with a glass of water before eating in the morning take every day for 14 days do not take more than 1 tablet a day do not use for more than 14 days unless directed by your doctor swallow whole. Do not chew, crush, or suck tablets. 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. Heartburn in children may sometimes be caused by a serious condition.	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.
Stop use and ask a doctor if:	• 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	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
Warnings	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	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
Do not use if	trouble or pain swallowing food, vomiting with blood, or bloody or black stools heartburn with lightheadedness, sweating or dizziness chest pain or shoulderpain with shortness of breath; sweating; pain spreading to arms, neck, or shoulders; or lightheadedness frequent chest pain	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
Label version	1 October 2025	19 March 2024

Esomeprazole is one half of omeprazole

Written by us

The relationship between the two is stated in the prescription Nexium label rather than on either box: esomeprazole is the S-isomer of omeprazole. Omeprazole as sold contains both mirror forms of the molecule; esomeprazole is one of them isolated.

That is a fact about chemistry, and neither over-the-counter label draws any conclusion from it. Neither claims an advantage over the other, and this page does not supply one.

The instructions are nearly identical

Written by us

Both are 20 mg once daily. Both are for adults 18 and over. Both treat frequent heartburn, defined the same way in both documents as heartburn occurring two or more days a week. Both state that they are not intended for immediate relief and may take 1 to 4 days for full effect. Both set a 14-day course and both limit that to one course every four months without a doctor.

The one visible difference is the form: Prilosec OTC is a delayed-release tablet, Nexium 24HR a delayed-release capsule that its label says to swallow whole, without crushing or chewing.

The lists of when to stop are the same list

Written by us

Both Drug Facts panels carry the same symptoms that mean seeing a doctor rather than continuing: heartburn for over three months, heartburn with lightheadedness, sweating or dizziness, chest or shoulder pain with shortness of breath, trouble swallowing, vomiting with blood, bloody or black stools, unexplained weight loss, wheezing with heartburn, nausea, vomiting and stomach pain.

When two documents from different manufacturers agree word for word, it is because the regulator wrote the wording. That is worth knowing when comparing products in this class: much of what looks like a considered difference is a shared template.

What would actually distinguish them is not in either label

Written by us

Anyone choosing between these two is usually asking which works better or which is gentler. Neither label answers that, because neither product was approved against the other. They were approved against their own evidence, and the documents are silent on comparison.

Price and habit are the differences a person can actually observe, and neither is a medical claim. Both are sold in supermarkets as well as pharmacies, both exist as store-brand versions of the same ingredients, and no label discusses cost at any point.

Common questions

Written by us

Is Nexium better than Prilosec?: Neither label makes that comparison and this page does not rank them. Their over-the-counter instructions are nearly identical: 20 mg once daily, adults 18 and over, a 14-day course for frequent heartburn.
What is the actual difference between omeprazole and esomeprazole?: Esomeprazole is the S-isomer of omeprazole, as the prescription Nexium label states. Omeprazole contains both mirror forms of the molecule, esomeprazole one of them. What that means for a person taking either is not addressed in the over-the-counter labels.
Can they be taken together?: Neither label describes taking two acid reducers at once. Both direct anyone whose heartburn continues past 14 days to a doctor rather than to a second product.

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.

FDA prescribing information for Prilosec OTC
The Procter & Gamble Manufacturing Company. Label version 17, effective 1 October 2025.
Full label on DailyMed Approval record NDA021229
FDA prescribing information for Nexium 24HR
Haleon US Holdings LLC. Label version 30, effective 19 March 2024.
Full label on DailyMed Approval record NDA204655

Other comparisons in this category

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.