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While antacids and antiallergic drugs in...

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

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Drugs designed to cure some ailment in one organ in the body do not affect the other because they work on different receptors. For example, secretion of histamine causes allergy. It also causes acidity due to release of hydrochloric acid in the stomach. Since antiallergic and antacids drugs work on different receptors, therefore, antihistamines relieve allergy while antacid remove acidity
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