Is diphenhydramine contraindicated in narrow angle glaucoma, acute asthma, and pregnancy? Why?

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.
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.

Related Questions

Please explain why is diphenhydramine contraindicated in narrow angle glaucoma, acute asthma and pregnancy?

Side effects. Antihistamines like Diphenhydramine have side effects that effect a certain part of the nervous system (cholinergic) which would cause bronchoconstriction, and further closing of the "angle" in glaucoma (angle closure type). If you must take an antihistamine, speak to your physician about antihistamines that do not or minimally affect this system. Good luck. Read more...

Is it true that diphenhydramine is contraindicated in narrow angle glaucoma, acute asthma and pregnancy?

DPH & Asthma, glauco. Diphenhydramine(dph), benadryl, (diphenhydramine) is an antihistaminic having an Atropine like effect, i.e. In asthma is dries up secretions in the bronchi ( the respiratory pipes), thus it worsens asthma. In glaucoma it can precipitate an acute angle closure glaucoma, yes it is unwise to use it. On other side effect is lethargy and in pregnancy it is also unwise to unnecessarily sedate the fetus. So, yes yes yes. Read more...
Asthma. Benedryl is generally safe for asthmatics. The secretion drying effect is minimal. Just don't push the dose very high. Read more...
BENADRYL (diphenhydramine) Benadryl (diphenhydramine) has sedating and anticholinergic effects. Caution or contraindicated in glaucoma, bph, delirium, dementia , hypotention and among the elderly.It is a cough suppressant in bronchial asthma and not to be given during first trimester of pregnancy. Read more...