Hi Angel,
Nexium is the brand name for the generic esomeprazole. Esomeprazole is known as a proton pump inhibitor. It works by blocking acid production in the stomach. You can read more about Nexium here. If you would like to know more about many of the medications that are prescribed for Acid Reflux, you can check them out here in the drugs database.
I hope this helps. Stay in touch and let us know how you are doing!
Vicki M
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