Omeprazole · Medicine question

How does omeprazole reduce stomach acid production?

iatroX medicinesPublished 8 November 2026

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Omeprazole becomes active in the highly acidic environment within stomach parietal cells, where it inhibits H+ K+‑ATPase (the acid pump), blocking the final step of acid formation and reducing both basal and stimulated acid secretion.

Sources for this answer

Losec Capsules 40mgNeon Healthcare Ltd · emc · SmPC §5.1 Pharmacodynamic properties · Version 24Document updated 24 February 2026

Sources checked 8 November 2026

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