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Losec 20 mg hard gastro-resistant capsules or Losec MUPS, a brand name of Omeprazole, is a drug which is used to help reduce the production of stomach acid to inhibit the symptoms of acid reflux and indigestion.This particular brand comes in both the full strength and half strength of Omeprazole. It is a medicine that belongs to the family of drugs known as proton pump inhibitors (PPI).