Esomeprazole is not an antibiotic, and it does not cure
chlamydia.
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Esomeprazole is an isomer of omeprazole.
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Yes, esomeprazole and omeprazole are different drugs.
Esomeprazole is an active metabolite of "omeprazole" and is more
active at the same dose. Both acts on "proton pump", reducing
stomach acidity.