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
Omeprazole
Prilosec vs. Omeprazole Dosage
Prilosec
Omeprazole
| 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 |
| 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
| 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
| 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
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