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===Muscarinic Receptor Antagonists===
 
===Muscarinic Receptor Antagonists===
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Examples are '''hyoscine''' and '''pirenzepine'''.
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===Histamine Receptor Antagonists===
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Examples are '''diphenhydramine''' and '''cyclizine'''.
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===Neurokinin (NK1) Receptor Antagonists===
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The new drug '''maropitant''' has become liscensed in the dog in the UK for use in treating vomiting and motion sickness.
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