June 27, 2010

MRCP 1 Question 5

A patient with allergic rhinitis develops acute urticaria. This is best relieved by
a) Antigen avoidance
b) combination of H1 and H2 antagonists
c) Antihistamine-decongestant preparation
d) Topical adrenergic agonist
e) oral adrenergic agonist




ANSWER
The correct answer is B

Explanation

For the treatment of acute urticaria, the combination of H1 and H2 antagonists is more effective than the H1 antagonist alone.

But for the treatment of pruritus from acute allergic reactions, the H1 antagonist is more effective than the H2 antagonist, and the combination offers no additional benefit.

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