2 doctors weighed in:
Is diphenhydramine contraindicated in narrow angle glaucoma, acute asthma, and pregnancy? Why?
2 doctors weighed in

Dr. Barbara Stark Baxter
Internal Medicine - Allergy & Immunology
In brief: Anti-cholinergic
Diphenhydramine's anticholinergic effects are to blame.
They cause it to aggravate increased intraocular pressure, and dry secretions in those having asthma attacks, making it hard to clear secretions. Here's a link: http://answers.Yahoo.Com/question/index?Qid=20090328145710aa3jfbq the link is wrong about pregnancy, though. It's category b, not c, for pregnancy and considered safer than other meds.

In brief: Anti-cholinergic
Diphenhydramine's anticholinergic effects are to blame.
They cause it to aggravate increased intraocular pressure, and dry secretions in those having asthma attacks, making it hard to clear secretions. Here's a link: http://answers.Yahoo.Com/question/index?Qid=20090328145710aa3jfbq the link is wrong about pregnancy, though. It's category b, not c, for pregnancy and considered safer than other meds.
Dr. Barbara Stark Baxter
Dr. Barbara Stark Baxter
Thank
Dr. Bud Kurwa
Ophthalmology
In brief: Yes
In patients with closable angles any dilating agent is dangerous as it can precipitate an attach of acute angle closure glaucoma.
Anti histamines are contraindicated. Best to see an ophthalmologist and get the angles checked. If they are indeed narrow and closable a laser procedure should be done to prevent a future attack.

In brief: Yes
In patients with closable angles any dilating agent is dangerous as it can precipitate an attach of acute angle closure glaucoma.
Anti histamines are contraindicated. Best to see an ophthalmologist and get the angles checked. If they are indeed narrow and closable a laser procedure should be done to prevent a future attack.
Dr. Bud Kurwa
Dr. Bud Kurwa
Thank
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