About Prilosec
Omeprazole (brand name Prilosec) is a proton pump inhibitor (PPI) used to reduce stomach acid production. It is one of the most widely used medications in the world and is available both by prescription and over-the-counter. Omeprazole is used to treat gastroesophageal reflux disease (GERD), stomach ulcers, Zollinger-Ellison syndrome, and to protect the stomach lining in patients taking NSAIDs. It provides more effective and longer-lasting acid suppression than antacids or H2 blockers like Pepcid (famotidine).
How It Works
Omeprazole irreversibly inhibits the H+/K+ ATPase enzyme (the "proton pump") on the surface of gastric parietal cells — the final step in stomach acid production. By blocking this pump, it reduces acid secretion by up to 95%, providing long-lasting relief from acid-related conditions. Maximum effect is reached after 3-4 days of regular use.
Key Facts
- ✓Available OTC (20 mg) and by prescription (up to 40 mg)
- ✓Take 30-60 minutes before the first meal of the day for best effect
- ✓Maximum acid suppression after 3-4 days of regular use
- ✓Long-term use may reduce magnesium and B12 absorption
- ✓Should not be used long-term without medical supervision
- ✓Generic omeprazole widely available — very affordable
Who Is Prilosec For?
Omeprazole is used for GERD, peptic ulcers, H. pylori infection (as part of combination therapy), Zollinger-Ellison syndrome, and NSAID-induced ulcer prevention. OTC omeprazole is intended for 14-day courses. Long-term prescription use requires regular monitoring for potential side effects including bone density loss, kidney issues, and magnesium deficiency. Not recommended during pregnancy unless clearly needed.
Snapshot
Cost
Estimated monthly cost:
Medical Disclaimer: This information is for educational purposes only and should not be used as a substitute for professional medical advice. Always consult your healthcare provider before starting, stopping, or changing any medication. Prices shown are estimates and may vary by location and pharmacy.