Prilosec vs. Omeprazole

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

Key Takeaways

  • Prilosec and generic omeprazole contain the exact same active ingredient and work identically in the body to reduce stomach acid.

  • Generic omeprazole typically costs far less than brand-name Prilosec, since most insurance plans favor it as the default option.

  • The two differ mainly in price and inactive ingredients like fillers and dyes, not in effectiveness, dosing, or side effects.

Prilosec vs. Omeprazole Drug Summary

Prilosec

Prilosec is the brand-name version of omeprazole, a proton pump inhibitor (PPI) that reduces stomach acid. It treats GERD, erosive esophagitis, ulcers, and hypersecretory conditions like Zollinger-Ellison syndrome. It's taken as a capsule, tablet, or oral suspension once or twice daily, usually before a meal.

Omeprazole

Omeprazole is the generic form of Prilosec, the same proton pump inhibitor that reduces stomach acid. It treats the same conditions: GERD, erosive esophagitis, ulcers, and hypersecretory disorders. It comes in the same capsule, tablet, and oral suspension forms, taken once or twice daily before a meal.

Prilosec vs. Omeprazole Side Effects

Prilosec

Most common
Headache (up to 6.9%)
Abdominal pain (up to 5.2%)
Nausea (up to 4%)
Diarrhea (up to 4%)

Omeprazole

Most common
Headache (up to 6.9%)
Abdominal pain (up to 5.2%)
Nausea (up to 4%)
Diarrhea (up to 4%)

Prilosec vs. Omeprazole Dosage

Prilosec

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 20 mg once daily At the start
Maximum dose 120 mg three times daily If needed
Dose changes 4 increases As tolerated

Omeprazole

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 20 mg once daily At the start
Maximum dose 120 mg three times daily If needed
Dose changes 4 increases As tolerated

Prilosec vs. Omeprazole Indications

Prilosec

Prilosec is FDA-approved to treat duodenal and gastric ulcers, erosive esophagitis from GERD, and pathological hypersecretory conditions like Zollinger-Ellison syndrome. It's also approved to maintain healing of erosive esophagitis and, combined with antibiotics, to help eradicate H. pylori infection. It is not intended for immediate heartburn relief.

  • Duodenal ulcer treatment

  • Gastric ulcer treatment

  • Erosive esophagitis from GERD

  • H. pylori eradication (with antibiotics)

  • Zollinger-Ellison syndrome

Omeprazole

Generic omeprazole carries the same FDA-approved uses as Prilosec, since it's the identical drug: ulcers, erosive esophagitis from GERD, and hypersecretory conditions like Zollinger-Ellison syndrome. It's also used with antibiotics to help eradicate H. pylori and to maintain healing after erosive esophagitis clears. Like brand Prilosec, it should not be used for fast heartburn relief.

  • Duodenal ulcer treatment

  • Gastric ulcer treatment

  • Erosive esophagitis from GERD

  • H. pylori eradication (with antibiotics)

  • Zollinger-Ellison syndrome

Prilosec vs. Omeprazole Pros and Cons

Prilosec

Prilosec and generic omeprazole are clinically identical, so choosing between them usually comes down to cost, insurance formulary rules, and consistency of inactive ingredients. Many insurance plans require the generic and won't cover brand Prilosec unless medically necessary. Brand-name manufacturing means every pill comes from one consistent source.

Pros

  • Consistent inactive ingredients every refill from one manufacturer

  • Widely recognized brand name, also sold OTC without a prescription

  • First PPI approved in the U.S., with the longest track record

Cons

  • Costs roughly $15 to $95 a month without insurance, more than the generic

  • Many insurance plans require step therapy through the generic first

  • No manufacturer coupons, since it's an older, established drug

Omeprazole

Generic omeprazole delivers the same active ingredient, dose for dose, as brand Prilosec, and it's the default option most pharmacies and insurance plans favor. Because multiple manufacturers produce it, the inactive ingredients and pill appearance can vary between refills. For most patients, the lower price makes it the practical first choice.

Pros

  • Costs roughly $4 to $15 a month with a coupon, well below brand Prilosec

  • Covered by nearly all insurance and Medicare plans without extra steps

  • Made by many manufacturers, reducing risk of supply shortages

Cons

  • Inactive ingredients like fillers and dyes can vary between manufacturers

  • Pill appearance may change month to month depending on pharmacy stock

  • No manufacturer patient-assistance programs like some brand drugs offer

Common Symptoms and Related Diseases You Can Explore

Explore a range of common symptoms the Doctronic Symptom Checker can help you understand.