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20mg delayed-release capsules — 24-hour acid reduction
Order Omeprazole OTC 20mg — Treats Frequent Heartburn for Up to 14 Days
20mg delayed-release capsules, 42-count (3 courses of treatment)
Omeprazole OTC 20mg is a proton pump inhibitor (PPI) used to treat frequent heartburn — defined as occurring 2 or more days per week. It is the same active ingredient as the prescription drug Prilosec but available over the counter for short-term relief. Unlike antacids that neutralize stomach acid after it forms, omeprazole works at the source by blocking acid production in the stomach lining.
Omeprazole 20mg is indicated for the relief of frequent heartburn (2+ days per week), acid reflux and GERD symptoms, sour stomach, acid indigestion, burning sensation in the chest and throat, and regurgitation of stomach contents. It is approved for OTC use and does not require a prescription for standard adult doses.
Omeprazole inhibits the hydrogen-potassium ATPase enzyme (the 'proton pump') in the parietal cells of the stomach lining. This enzyme is responsible for the final step of acid secretion. By blocking it, omeprazole significantly reduces the volume and concentration of stomach acid produced. It takes 1–4 days to reach full effect and should be taken for a full 14-day course for best results.
Take 1 capsule (20mg) once daily before eating in the morning for 14 days. Do not chew or crush — swallow whole. Do not take for more than 14 days unless directed by a doctor. May repeat a 14-day course every 4 months as needed. The 42-count pack provides three complete 14-day courses of treatment. Results may not be immediate — allow 1–4 days for full effect.
Omeprazole OTC is for adults 18 and older. Not for immediate relief of heartburn — use an antacid for that. Consult a doctor before use if you take warfarin, clopidogrel, or prescription drugs for HIV or fungal infections. Not recommended during pregnancy without medical advice. Seek medical attention if heartburn continues after 14 days.
Omeprazole is generally well-tolerated. Common side effects include headache, diarrhea, stomach pain, nausea, and gas. Long-term use (beyond recommended OTC duration) may affect magnesium levels and bone health. Rare: allergic reactions. Stop use and consult a doctor if you have difficulty swallowing, vomiting blood, or black/tarry stools.
Promedic is a licensed US online pharmacy committed to providing FDA-approved OTC medications at competitive prices. We source all products from reputable US-licensed distributors and manufacturers. Every order is handled with discretion, packaged securely, and shipped to all 50 states. Our pharmacy team is available to answer any questions about Omeprazole 20mg or any other products in our inventory. Order with confidence — quality and customer service are our top priorities.
Do I need a prescription to buy Omeprazole 20mg?
No. Omeprazole 20mg is an over-the-counter (OTC) medication available without a prescription for standard adult use.
How quickly will my order arrive?
We offer standard and expedited shipping to all 50 US states. Contact us for estimated delivery times to your location.
Is the generic version as effective as the brand name?
Yes. All OTC medications we carry must meet FDA quality and efficacy standards. Generic versions contain the same active ingredient at the same strength as their branded equivalents.
Omeprazole begins reducing acid production within 1–4 days, but full effect takes 1–4 weeks of daily use. It is not designed for immediate heartburn relief (use antacids like Tums for that). Omeprazole works best taken 30–60 minutes before your first meal. Source: MedlinePlus: Omeprazole.
OTC omeprazole is intended for 14-day treatment courses, up to 3 times per year. Long-term daily use (beyond 14 days) without medical supervision is not recommended — it can reduce magnesium and B12 absorption and may mask serious conditions. See your doctor if symptoms persist. See: FDA PPI Safety Communication.
Antacids (Tums, Rolaids) neutralize existing acid for quick but short-lived relief. Omeprazole is a Proton Pump Inhibitor (PPI) that blocks acid production at its source, providing longer-lasting relief for frequent heartburn, GERD, and acid reflux. For occasional heartburn, antacids suffice; for frequent symptoms (2+ days/week), omeprazole is more effective.
Take omeprazole 30–60 minutes before your first meal of the day for maximum effectiveness. The drug needs to be activated by stomach acid pumps that are most active after fasting. Do not crush or chew delayed-release capsules — swallow whole.
Omeprazole can interact with clopidogrel (blood thinner), methotrexate, and some antifungals. Always inform your pharmacist about all medications you take. Source: FDA Drug Interactions.
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Healthcare Professional & Medical Reviewer, Promedic
Andrew Gaon is a healthcare professional and medical reviewer at Promedic, where he helps ensure that medical content is accurate, evidence-based, and easy for patients to understand. He reviews articles for clinical accuracy, current treatment guidelines, and patient safety, ensuring information meets high editorial and healthcare standards. Andrew is dedicated to providing reliable, trustworthy medical information that empowers patients to make informed healthcare decisions.