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JEE Main · 2021 · 16 Mar 2021 · Shift 1 · Chemistry in Everyday Life

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The functions of antihistamine are:
  1. (A)Analgesic and antacid
  2. (B)Antiallergic and Analgesic
  3. (C)Antacid and antiallergic✓ Correct
  4. (D)Antiallergic and antidepressant

Answer: (C)

Solution

Histamine released from mast cells dilates blood vessels, contracts bronchial muscle and produces the swelling and itching of an allergic attack, and the same molecule acting on the parietal cells of the stomach stimulates secretion of hydrochloric acid.
A drug that blocks histamine at the receptor therefore suppresses the allergic response, while one that blocks it at the receptor cuts acid output and relieves hyperacidity; cimetidine and ranitidine work in this second way.
Antihistamines accordingly act as antacid and antiallergic agents.

JEE Main · 2021 · 16 Mar 2021 · Shift 1 · Single correct option

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