How Long Does It Take for Omeprazole to Work?
Medically reviewed by Andre Stone | MD, University of Pittsburgh School of Medicine on August 25th, 2026.
Omeprazole typically begins working within 1-3 days, with full effectiveness reached after 4-5 days of consistent use. This proton pump inhibitor blocks acid production in your stomach by inhibiting the H+/K+-ATPase enzyme system. Most people experience significant heartburn and acid reflux relief within the first few days, though complete healing of erosive esophagitis may take 4-8 weeks. For optimal results, take omeprazole 30-60 minutes before your first meal of the day. Many people with GERD symptoms improve during the first week of treatment, but response times vary.
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