Buy Omeprazole (Prilosec) — Online Prescription

Omeprazole reduces stomach acid. Over the counter, it treats frequent heartburn (2 or more days a week) in a 14-day course. By prescription, it treats GERD and erosive esophagitis (acid damage to the esophagus), duodenal and gastric ulcers, H. pylori infection (with antibiotics), and rare acid-overproduction conditions such as Zollinger-Ellison syndrome. It is not an antacid and does not give instant relief.

Yes. Omeprazole is the generic name and Prilosec is the brand. Prilosec OTC and store brands (CVS, Walgreens, Walmart and others) sold as "omeprazole delayed-release tablets 20 mg" contain the same medicine. Brand prescription Prilosec in the US today is only a suspension powder for children and feeding tubes; adult prescriptions are filled with generic omeprazole capsules.

It's a standard higher dose, not an unusual one. 20 mg once daily is the usual dose for heartburn, GERD and duodenal ulcers; 40 mg once daily is the labeled dose for gastric ulcers and some H. pylori regimens, and prescribers sometimes use 40 mg (or 20 mg twice daily) for GERD that doesn't respond to 20 mg. Higher doses — up to 120 mg three times daily — are used only for rare conditions like Zollinger-Ellison syndrome under a specialist. The OTC maximum is one 20 mg tablet in 24 hours.

For self-treatment with OTC omeprazole, the maximum is one 20 mg tablet per 24 hours for 14 days. With a prescription, typical maximums are 40 mg a day for ulcers and reflux (sometimes split as 20 mg twice daily). Only rare hypersecretory conditions justify more, under specialist care. Taking extra doses doesn't speed up relief — omeprazole needs days to reach full effect.

Before a meal — ideally 30 to 60 minutes before breakfast. Omeprazole blocks acid pumps that are switched on by food, so it works best when it's already in your system when you eat. If you take it twice daily, the second dose goes before dinner. Swallow capsules and delayed-release tablets whole.

You can, and it will still work partially, but it works best on an empty stomach before a meal. If you forget your morning dose, take it before your next meal rather than skipping the day. If it's nearly time for the next dose, skip the missed one — never double up.

Some people feel relief within 24 hours, but the OTC label says full effect takes 1 to 4 days, because omeprazole shuts down acid pumps gradually. Healing of erosive esophagitis takes 4 to 8 weeks. For instant relief of a single heartburn episode, an antacid (like Tums) or famotidine works faster.

Occasionally. In the FDA clinical trials, constipation was reported by about 2% of patients, along with acid regurgitation, dizziness and rash at similar rates. Diarrhea (about 4%) is slightly more common than constipation. Severe or persistent watery diarrhea on a PPI can be a sign of C. difficile infection and should be checked.

Weight gain is not listed as a side effect in omeprazole's FDA label. Some people eat more comfortably once reflux is controlled, which can lead to gradual weight gain, and some observational studies have linked long-term PPI use to small weight increases. Because extra weight worsens reflux, it's worth watching — weight loss is one of the most effective non-drug GERD treatments.

It's usually rebound acid hypersecretion. While you take a PPI, your stomach builds extra acid-producing capacity; when you stop, that capacity briefly overshoots. In a controlled trial, 44% of healthy volunteers with no prior heartburn developed acid symptoms after stopping 8 weeks of a PPI, versus 15% on placebo. It typically fades within a few weeks. Tapering the dose or using famotidine or antacids as a bridge helps — and it doesn't mean you necessarily need a PPI forever.

Yes, and prescribers sometimes do this — for example, omeprazole in the morning with famotidine at bedtime for night-time symptoms, or famotidine as a bridge while stepping off omeprazole. There's no dangerous interaction between them. If you find you routinely need both, tell your prescriber so your regimen can be reviewed.

Very close, but not identical. Nexium is esomeprazole — one of the two mirror-image halves of the omeprazole molecule. It's cleared more slowly, so the same milligram dose gives somewhat more acid suppression, but at comparable doses real-world results are similar for most people. Both are available OTC at 20 mg. Generic omeprazole is usually the cheaper of the two.

For people who need it — such as those with Barrett's esophagus, severe erosive esophagitis or a history of bleeding ulcers — long-term use is often appropriate and the benefits outweigh the risks. The FDA label warns about C. difficile diarrhea, fractures with high-dose or long-term use, low magnesium, vitamin B12 deficiency after about 3 years, and stomach polyps after about a year. The American Gastroenterological Association advises that everyone on a PPI without a clear long-term reason should periodically try to step down to the lowest effective dose or stop.

The evidence doesn't show that it does. Some large observational studies have found an association between long-term PPI use and dementia, but a 2024 Mendelian randomization study — a method designed to test cause rather than correlation — found no causal link. It's reasonable to ask your prescriber whether you still need a PPI, but not a reason to stop a medication you need.

Available human data, including first-trimester exposure, haven't shown an increased risk of major birth defects, and omeprazole is among the better-studied acid reducers in pregnancy. Heartburn is very common in pregnancy; talk with your OB, who may suggest lifestyle measures, antacids or famotidine first.

Omeprazole blocks the liver enzyme (CYP2C19) that activates clopidogrel, weakening its protection against clots — a real concern after a stent or heart attack. The label says to avoid the combination. Pantoprazole or famotidine are common alternatives. This applies to OTC Prilosec too.

Veterinarians do prescribe omeprazole for animals — for example, for gastric ulcers in horses — but doses and products differ from human use. Never give a pet your own omeprazole without your veterinarian's direction.

No. Omeprazole is not on any DEA schedule and has no abuse potential. The 20 mg strength is sold over the counter for short courses; prescription use covers higher doses and diagnosed conditions.