Key takeaways
Prilosec (omeprazole) is available over the counter (OTC) as 20 mg tablets.
OTC Prilosec shouldn’t be used for more than 14 days; if symptoms persist or worsen, talk to your healthcare provider.
Prescription Prilosec is available in more doses and for additional uses, and generic omeprazole may cost less than the OTC version.
If you’ve ever reached for Prilosec to relieve heartburn, you may have noticed it comes in both over-the-counter (OTC) and prescription strengths.
Prilosec (omeprazole) is available without a prescription for frequent heartburn, while prescription omeprazole may be used for other conditions and at different doses.
Here’s what to know about OTC Prilosec, how it compares with prescription omeprazole, and when a prescription may be the better option.
What is Prilosec (omeprazole)?
Prilosec is the brand name for omeprazole, a proton pump inhibitor (PPI) that reduces stomach acid production. Brand-name Prilosec and generic omeprazole contain the same active ingredient and are both widely available. They’re used to treat heartburn and gastroesophageal reflux disease (GERD). According to the National Institutes of Health, omeprazole is one of the most commonly prescribed drugs in the United States.
PPIs like omeprazole work by blocking acid pumps in the stomach lining. This lowers stomach acid, helping prevent or treat acid reflux, heartburn, and, with higher-strength prescription Prilosec, stomach ulcers or esophageal damage.
Is Prilosec available over the counter?
Yes, Prilosec is available over the counter as Prilosec OTC, a 20-milligram (mg) omeprazole tablet. Omeprazole OTC is also available under several store-specific generics.
Prilosec OTC is specifically approved to treat frequent heartburn (occurring two or more days per week) for up to two weeks at a time. Prilosec OTC is “absolutely not” intended to be used daily indefinitely, according to Supriya Rao, MD, a board-certified gastroenterologist, obesity medicine, and lifestyle medicine physician in the greater Boston area.
Though Prilosec OTC is available without a prescription at most pharmacies and retailers, it isn’t the best medicine for every acid-related condition. Dr. Rao points out that it’s not a fast-acting heartburn medicine like Tums or Mylanta. Prescription Prilosec is also a more appropriate dose for certain symptoms and conditions.
What is the difference between OTC Prilosec and prescription omeprazole?
The biggest differences between OTC Prilosec and prescription omeprazole are dosage strength, approved uses, and how long you can safely take them.
- Dosage: OTC Prilosec is available only as once-daily 20 mg tablets. Prescription Prilosec (omeprazole) comes in a wider range of doses: 10 mg, 20 mg, and 40 mg.
- Approved uses: OTC Prilosec is used to self-treat heartburn, whereas the prescription version is FDA approved to treat GERD, peptic ulcers, erosive esophagitis, and Zollinger-Ellison syndrome. When taken with certain antibiotics, prescription Prilosec can also treat H. pylori infections.
- Duration of use: OTC Prilosec should be limited to 14-day courses, not repeated within four months (unless your healthcare provider approves). Dr. Rao says prescription PPI use can be long-term when prescribed by a licensed healthcare professional, such as a gastroenterologist.
- Cost and coverage: OTC medications are not always covered by insurance, though the retail price may be lower than the cash price of a prescription drug. Some insurance plans may cover the prescription generic omeprazole.
OTC Prilosec vs. prescription omeprazole at a glance |
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|---|---|---|
| Category | OTC Prilosec | Prescription omeprazole |
| Active ingredient | Omeprazole | Omeprazole |
| Dosage | 20 mg | 10 mg, 20 mg, or 40 mg |
| Dosage forms | Once-daily tablets (swallow whole) | Once-daily tablets or oral suspension |
| Approved uses |
|
|
| Common side effects |
|
|
| Duration of use | Up to two weeks every four months | Depends on prescription |
| Cost and coverage | Low cost, but unlikely to be covered by insurance | Low-cost generic; coverage varies by insurance plan |
Bottom line: OTC and prescription Prilosec share the same active ingredient (omeprazole), but differ in dosing, approved uses, and duration for safety and effectiveness.
When should you use OTC Prilosec vs. prescription omeprazole?
OTC Prilosec is used for frequent heartburn, while prescription omeprazole is typically used for more serious acid-related conditions diagnosed by a healthcare provider. As Dr. Rao says, “Prescription omeprazole is for patients who have conditions like esophagitis, stomach ulcers, Barrett’s esophagus, or pretty severe reflux.”
Prilosec OTC may be a good choice for people who have heartburn two or more times per week and want to manage symptoms on their own. However, you should see a healthcare provider if symptoms last more than 2 weeks or are accompanied by warning signs. “See your doctor … if you experience warning signs like difficulty swallowing, unintended weight loss, or GI bleeding,” says Heather Gosnell, MD, a board-certified pediatrician and founder of Eat Plants MD Coach in Phoenix, Arizona.
If heartburn doesn’t improve after taking Prilosec OTC, or symptoms are severe, prescription Prilosec may be a better option. A healthcare professional can help determine the right treatment based on your symptoms, health history, and other medications or supplements you take.
How much does Prilosec OTC vs. prescription omeprazole cost?
Your out-of-pocket cost for Prilosec OTC or prescription omeprazole depends on the dose, pharmacy, insurance coverage, and whether you use discounts or coupons.
OTC Prilosec is widely available at pharmacies and retailers and typically costs about $20–$30 for a 28-count box. Insurance is unlikely to cover an over-the-counter heartburn medication.
Prescription Prilosec is available as low-cost generic omeprazole, which may be less expensive than OTC Prilosec. This is especially true if insurance covers part of the cost, or you use a prescription discount card like SingleCare. For example, the average retail price for 30, 40 mg delayed-release omeprazole capsules is $172, but a SingleCare coupon may lower the price to as little as $6.
Medication costs vary by pharmacy, dose, and insurance coverage. If your healthcare provider agrees that omeprazole is necessary, a prescription for generic omeprazole may be cheaper than buying Prilosec over the counter.
Prilosec OTC vs. prescription omeprazole prices |
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|---|---|---|
| Category | Prilisec OTC | Prescription omeprazole |
| Average cost without insurance | $25 for a box of 28 delayed-release tablets | $172 for 30 tablets of 40 mg delayed-release omeprazole |
| SingleCare’s lowest price | $14 for a box of 28 delayed-release tablets at Kroger and Harris Teeter | $6 for 30 tablets of 40 mg delayed-release omeprazole at Kroger and Harris Teeter |
| Coupons | Prilosec OTC coupon | Generic prescription omeprazole coupon |
How to save on Prilosec and omeprazole
There are a few ways to lower the cost of Prilosec OTC, OTC omeprazole, or prescription versions of these drugs.
- Compare prices before buying. Medication prices vary by location, so enter your ZIP code on SingleCare.com to compare prices at pharmacies near you and find the best deal on Prilosec or omeprazole.
- Use a coupon or discount card. Pharmacy discount cards or a SingleCare discount card (at participating pharmacies) can help you save. For example, a SingleCare discount card can bring the price down to as low as $6 for a one-month supply of prescription omeprazole.
- Ask your provider for a generic prescription. Prescription omeprazole can sometimes cost less than the over-the-counter version. If a prescription is medically necessary, ask your provider about generic omeprazole.
- Check for insurance coverage. Most insurance plans don’t cover OTC medications, but many cover prescription generic omeprazole. Check your insurance policy’s prescription drug formulary (a list of covered medications) to see if omeprazole is included.
Save up to 80% on Prilosec with SingleCare Different pharmacies offer different prices for the same medication. SingleCare helps find the best price for you.
Frequently asked questions
How long does it take for Prilosec OTC to start working?
Don’t expect immediate relief. “Prilosec OTC can start providing relief within 24 hours for some people, though it typically takes 1 to 4 days to reach its full effect,” Dr. Gosnell says.
Is it okay to take Prilosec OTC every day?
Yes, but only short-term. Dr. Rao says Prilosec OTC can be taken daily for up to a 14-day course of treatment (if needed), but daily use is not a “forever-type deal.”
What is the safest acid reducer for long-term use?
There’s no one-size-fits-all answer. Dr. Gosnell says famotidine can be a good choice for milder symptoms, and Dr. Rao says that lifestyle changes should be part of any long-term plan. Talk to your provider about whether PPIs like omeprazole, pantoprazole, or Prevacid (lansoprazole) would be a safe long-term treatment for your symptoms.
The SingleCare prices in this article are the most accurate at the time of publishing in ZIP code 23666 as of Jun. 8, 2026. Prices vary by pharmacy. Visit our coupon page for updated drug prices at pharmacies near you.
- Omeprazole, StatPearls (2023)
- Proton pump inhibitors, National Institutes of Health (2023)
- Ompeprazole, MedlinePlus (n.d.)
- Prilosec OTC drug label, Food and Drug Administration (2022)
- Prilosec – omeprazole magnesium capsule, DailyMed (2010)
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