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Explain the following with suitable exam...

Explain the following with suitable examples.
Antihistamines

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Antihistamines : Synthetic drugs which interfere with the natural action of histamine by competing with histmine for binding sites of receptor where histamine exerts its effect are called antihistamines.
Common antihistamines are brompheniramine (Dimetapp) and terfenadine (Seldane).
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