What if i have narrow angle glaucoma-- what allergy medications are safe?

Laser: Have you had laser peripheral iridotomy and/or goniotomy to prevent closure? The medications that can exacerbate angle closure are anything that dilates the eye, Antihistamines and decongestants; Asthma medicines; Motion sickness medicines, and some medicines used to treat depression (tricyclic antidepressants)

Avoid antihistamine: The older antihistamines (Benadryl, Atarax etc) possess anti-cholinergic action which may be good in drying up the nose but not for the glaucoma. There is a hypothetical risk that nasal steroid would increase intraocular pressure but the risk is likely very low and one can assess it by having the eye pressure monitored. The safety of intranasal antihistamine has not been established yet.