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A member asked:
How do vasodilators work in patients with allergic reactions?
A doctor has provided 1 answer
They generally don't: In allergic reactions, the blood vessels actually dilate. This is what causes the swelling often seen in allergic reactions. On the other hand, decongestant agents are used to treat allergic reactions; their mechanism of action is to constrict the blood vessel and decrease local swelling.
Answered 5/14/2014
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