Both antacids and antiallergic drugs are antihistamines but they cannot replace each other. Explain why?

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Solution

Antihistamines are the drugs which control the allergy effects produced by histamines. Antacids are the substances which neutralize gastric acidity. Antihistamine does not affect the secretion of acid in the stomach and the reason is that both antiallergic and antacid drugs work on different receptors. Therefore, antihistamines remove allergy while antacids remove acidity.

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While antacids and antiallergic drugs interfere with the function of histamines, why do these not interface with the function of each other ?

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Amongst the following antihistamines, which are antacids?
(a) Ranitidine
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