Zegerid: Omeprazole With Sodium Bicarbonate Explained

Zegerid is omeprazole, the same PPI as Prilosec, combined with sodium bicarbonate (baking soda). Standard omeprazole is wrapped in a delayed-release coating to protect it from stomach acid. Zegerid uses the sodium bicarbonate instead: it briefly neutralizes stomach acid so the unprotected, immediate-release omeprazole survives and is absorbed quickly. The result is the same acid-blocking drug, absorbed faster, with good night-time acid control in studies. The trade-off is that each dose contains a significant amount of sodium.

Most people have never heard of Zegerid, even though it sits on the same shelf as Prilosec OTC and Nexium. Below I explain how it differs from regular omeprazole, what the research shows about night-time acid, the OTC and prescription versions, who should avoid it because of the sodium, and whether it makes any difference for silent reflux.

Key Takeaways

• Zegerid combines immediate-release omeprazole with sodium bicarbonate, which protects the omeprazole from stomach acid so it can be absorbed quickly.
• Zegerid OTC contains omeprazole 20 mg and sodium bicarbonate 1,100 mg per capsule, which provides about 303 mg of sodium per dose.
• Like Prilosec OTC, Zegerid OTC is a 14-day course of one capsule a day, taken at least 1 hour before breakfast. Courses shouldn’t be repeated more than once every 4 months without a doctor’s advice.
• It’s not for instant relief. Full effect can take 1 to 4 days, as with other PPIs.
• In a study of people with night-time GERD symptoms, immediate-release omeprazole taken at bedtime kept stomach pH above 4 for 55% of the night, compared with 27% for pantoprazole taken before dinner.
• Avoid it, or check with your doctor, if you’re on a sodium-restricted diet or have heart failure, high blood pressure or kidney disease.
• It has the same drug interactions and long-term considerations as other omeprazole products.
• For silent reflux (LPR), faster acid suppression doesn’t solve the pepsin problem, so Zegerid isn’t a breakthrough for throat symptoms.

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What Is Zegerid?

Omeprazole is broken down by stomach acid. That’s why standard omeprazole (Prilosec, generics) comes as delayed-release capsules or tablets with an acid-resistant coating that dissolves later, in the small intestine.

Zegerid takes a different approach. It contains immediate-release omeprazole with no protective coating, plus sodium bicarbonate. When you swallow it, the bicarbonate quickly raises the pH in your stomach, protecting the omeprazole long enough for it to be absorbed. Once absorbed, it works exactly like any other omeprazole: it switches off the proton pumps that make acid. See omeprazole side effects.

Versions available

• Zegerid OTC: omeprazole 20 mg + sodium bicarbonate 1,100 mg capsules, for frequent heartburn
• Prescription Zegerid and generic omeprazole/sodium bicarbonate: capsules and powder for oral suspension in 20 mg and 40 mg omeprazole strengths. The powder is useful for people who can’t swallow capsules or who use feeding tubes.

Zegerid OTC: Drug Facts

According to the Zegerid OTC Drug Facts label [Zegerid OTC label]:

• Active ingredients: omeprazole 20 mg (acid reducer) and sodium bicarbonate 1,100 mg (to allow absorption of the omeprazole)
• Sodium: 303 mg per dose
• Use: treats frequent heartburn (2 or more days a week). It isn’t for immediate relief, and full effect may take 1 to 4 days.
• Directions: adults 18 and over, 1 capsule a day for 14 days. Swallow it whole with water at least 1 hour before eating in the morning. Don’t chew, crush or open it. Don’t repeat the 14-day course more often than every 4 months unless directed by a doctor.
• Ask a doctor first if you’re on a sodium-restricted diet, have had heartburn for more than 3 months, or have chest pain, unexplained weight loss, or heartburn with lightheadedness or sweating.
• Ask a doctor or pharmacist first if you take warfarin, clopidogrel, cilostazol, prescription antifungals, diazepam, digoxin, tacrolimus, mycophenolate mofetil, HIV medicines, methotrexate or other prescription drugs.

Zegerid vs Prilosec (and Other PPIs)

Both products deliver the same drug at the same dose. Zegerid’s differences are absorption speed and sodium content. For most people taking a PPI in the morning for daytime heartburn, there’s little practical difference, and regular omeprazole is cheaper and sodium-free. See Prilosec vs Nexium and omeprazole vs esomeprazole.

Where Zegerid Stands Out: Night-Time Acid

The most interesting research on immediate-release omeprazole concerns nocturnal acid breakthrough, the acid that escapes PPI control overnight, which is a common problem for people with night-time reflux.

In a randomized crossover study of 36 people with night-time GERD symptoms, immediate-release omeprazole 40 mg taken at bedtime kept stomach pH above 4 for 55% of the night, with a median overnight pH of 4.7. Delayed-release pantoprazole 40 mg taken before dinner managed only 27% of the night, with a median pH of 2.0. Nocturnal acid breakthrough occurred in 53% of people on bedtime immediate-release omeprazole, compared with 78% on pantoprazole [Castell et al., Alimentary Pharmacology & Therapeutics, 2005].

Two caveats. That study used the 40 mg prescription strength taken at bedtime, which is not how Zegerid OTC is labeled (once in the morning). It was also a small, open-label study. Still, it explains why some doctors prescribe immediate-release omeprazole at night for stubborn nocturnal symptoms. If that’s you, it’s worth discussing with your doctor rather than changing the OTC timing yourself. See acid reflux at night and best time of day to take omeprazole.

The Sodium Issue

Each Zegerid OTC capsule contains about 303 mg of sodium. That’s roughly an eighth of the 2,300 mg daily limit in US dietary guidelines, from a single capsule. Prescription strengths contain more sodium bicarbonate than the OTC capsule.

For most healthy people taking it for 14 days, this isn’t a problem. It does matter if you:

• Have high blood pressure
• Have heart failure
• Have kidney disease
• Have been told to follow a low-sodium diet
• Have metabolic alkalosis, or are taking other sodium bicarbonate products (including using baking soda for heartburn)

If any of these apply, a standard delayed-release omeprazole without the sodium is usually the better choice.

Side Effects and Long-Term Use

Because the active drug is omeprazole, Zegerid shares its side effects and long-term considerations:

• Short term: headache, diarrhea, nausea and abdominal pain are the most common
• Long term: possible effects on B12, magnesium, bone density and gut infections. See PPIs and bone density and PPIs and infection risk.
• Interactions: the same as omeprazole, notably clopidogrel and some other drugs. See omeprazole drug interactions.
• Stopping: rebound acid can occur after longer courses. See getting off PPIs.

For pregnancy, see is omeprazole safe in pregnancy?, and check with your provider about the sodium content too.

Is Zegerid Better for Silent Reflux (LPR)?

Probably not in any meaningful way. With LPR, the problem isn’t only how acidic the refluxate is. It’s that stomach contents, including pepsin, reach the throat at all. Faster or stronger acid suppression doesn’t stop reflux happening, and pepsin already lodged in throat tissue can still be reactivated by acidic food and drink. That’s why PPIs, including Zegerid, often disappoint people with throat symptoms. See why PPIs don’t work for LPR and PPIs for LPR.

Where it might help is with significant night-time reflux, if your doctor prescribes immediate-release omeprazole at bedtime, ideally alongside an alginate such as Gaviscon Advance and a low-acid diet.

Who Might Choose Zegerid

• Good fit: people who don’t get enough relief from standard omeprazole timing, those whose doctor recommends immediate-release omeprazole for night-time symptoms, and people who need the powder form because they can’t swallow capsules
• Poor fit: anyone watching their sodium, people with heart, kidney or blood pressure problems, and those who are happy on cheaper delayed-release omeprazole

Conclusion

Zegerid is omeprazole with a twist. Instead of an acid-resistant coating, sodium bicarbonate protects the drug in the stomach so it’s absorbed faster. It’s the same medication as Prilosec at the same OTC dose, and it isn’t for instant relief. Its main real advantage shows up in night-time acid control when taken at bedtime on prescription, and its main drawback is about 303 mg of sodium per OTC dose.

Whatever PPI you use, it reduces acid but doesn’t stop reflux. If you’re relying on one for months, the most effective long-term step is reducing how much reflux you have through what and when you eat. The Wipeout Diet Plan gives you a step-by-step, low-acid way to eat. I built it around LPR, the hardest form of reflux to control, and it works just as well for GERD and everyday heartburn.

Frequently Asked Questions

What is the difference between Zegerid and Prilosec?

Both contain omeprazole. Prilosec uses a delayed-release coating to protect it from stomach acid. Zegerid uses immediate-release omeprazole with sodium bicarbonate, which is absorbed faster but adds about 303 mg of sodium per OTC dose.

Is Zegerid stronger than omeprazole?

No. It contains the same omeprazole at the same dose. It’s absorbed faster, which may give better night-time acid control when taken at bedtime on prescription, but it isn’t a stronger drug.

When should I take Zegerid OTC?

Once a day, at least 1 hour before eating in the morning, for 14 days. Swallow it whole with water.

How much sodium is in Zegerid?

Zegerid OTC contains about 303 mg of sodium per capsule. Prescription strengths contain more sodium bicarbonate.

Does Zegerid work immediately?

No. Like other PPIs, it may take 1 to 4 days for full effect. For immediate relief, an antacid or alginate works faster.

Can I take Zegerid at night?

The OTC label says to take it in the morning before eating. Some doctors prescribe immediate-release omeprazole at bedtime for night-time reflux. Discuss it with your doctor rather than changing the timing yourself.

Is there a generic version of Zegerid?

Yes. Generic omeprazole/sodium bicarbonate is available in prescription strengths, and some store brands sell an OTC version.

Research & References

• The US Drug Facts label for Zegerid OTC (omeprazole 20 mg, sodium bicarbonate 1,100 mg, 303 mg sodium per dose), including the 14-day course, morning dosing, sodium and drug interaction warnings [Zegerid OTC label].
• A randomized crossover study of 36 people with nocturnal GERD symptoms finding that bedtime immediate-release omeprazole 40 mg kept gastric pH above 4 for 55% of the night (median pH 4.7), compared with 27% (median pH 2.0) for pantoprazole 40 mg before dinner, with nocturnal acid breakthrough in 53% vs 78% [Castell et al., Alimentary Pharmacology & Therapeutics, 2005].

David Gray

12 years living with LPR · Consultant & researcher

Every claim sourced to peer-reviewed research Editorial policy

I've lived with LPR for twelve years — the misdiagnoses, the PPI courses that did nothing, the slow work of figuring out what actually helps. Wipeout Reflux is where I translate the research into plain terms for people stuck in the same place. Every claim here is sourced to peer-reviewed work, and I consult one-to-one with LPR sufferers.

View all articles by David Gray