| A - Alimentary Tract and Metabolism | | |
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| A02 - Drugs for Acid Related Disorders | | |
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| A02B - Drugs for Peptic Ulcer and Gastro-Oesophageal Reflux Disease (Gord) | | |
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| A02BC - Proton Pump Inhibitors | Proton pump inhibitors in combination with domperidone are classified here in 50-levels. Potassium-competitive acid blockers e.g. vonoprazan are classified in this group.
| The DDDs are based on treatment of gastro-oesophageal reflux disease.
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