How Omeprazole Works. Medically reviewed by Alisha D. Sellers, BS Pharmacy, PharmD — Written by Helen Marshall, BPharm, MRPharmS on May 2, 2025. How it works; How long it takes to work; ...

Omeprazole oral capsule is a prescription drug that reduces the amount of acid in your stomach. It’s used to treat gastric or duodenal ulcers, GERD, erosive esophagitis, and hypersecretory ...

Omeprazole works by inhibiting the proton pump, which is responsible for strong acid in the stomach. It is believed, but not proven, that reducing acid in the stomach will reduce the risk of ...