Question

why antihistamine is contraindicated in asthmatic patient?

Answer 1

Diphenhydramine is an antihistamine of the ethanolamine class.
Diphenhydramine is relatively contraindicated in patients with asthma and COPD, especially during acute attacks, because anticholinergic actions may thicken secretions and reduce expectoration.

Answer 2

so all antihistamines have anticholinergic effect??

Answer 3

http://www.medicinenet.com/decongestant_antihistamine_anticholinergic/article.htm
Read this article..It might help you..:)

Answer 4

@rawanhamdi : are u malaysian ?? O.o

Answer 5

thank u both..that was helpful
no..!

Answer 6

haha..orite :) no ? so ? whre you come from ?

Answer 7

Back in the 1970's, many doctors thought that antihistamines were bad for people with asthma, because the antihistamines would dry out the air passageways.

When our air passageways get dry, they can become irritated and inflamed.
This causes the air passageways to puff up, and narrow, which would make it harder for a person to breathe.

But in 1990, the Food Drug Administration said that most antihistamines are actually perfectly fine for people with asthma.
Many doctors began to find that people with asthma may actually have a greater need for antihistamines.

So basically, what doctors commonly believed in the 1970's became a "scientific myth."
There's no reason for why asthma should be a contraindication for antihistamines.

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I've explained why many people USED to believe that antihistamines shouldn't be used by people with asthma. Maybe that's the answer your question wants. But I honestly have no idea why that question is even asked.