| 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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| A02BA - H2-Receptor Antagonists | Ranitidine bismuth citrate is classified here, whereas other bismuth salts are classified in A02BX.
| The DDDs are based on treatment of peptic ulcers.
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