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==Antacids==
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These are administered orally and need frequent aministration when given to small animals. They work be chemically neutralising the acidic environment of the stomach.
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Examples are: '''magnesium carbonate, magnesium hydroxide, magnesium trisilicate, magnesium oxide, aluminium hydroxide''' and '''sodium bicarbonate'''.
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==Histamine (H<sub>2</sub>) Receptor Antagonists==
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Examples are '''cimetidine, ranitidine''' and '''famotidine'''.
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They can be administered orally or by injection and work by inhibiting the action of histamine on parietal cells. This results in reduced production of H<sup>+</sup> ions and pepsin secretion.
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