Cold Medicines to Avoid with Narrow-Angle Glaucoma: A Safety Guide

Narrow-angle (angle-closure) glaucoma is a condition where the iris blocks the drainage angle, risking acute intraocular pressure (IOP) spikes. Many over-the-counter cold medications can precipitate an attack by dilating the pupil.

Mechanism of Risk

Pupillary dilation (mydriasis) causes the peripheral iris to bunch up, further narrowing or closing the angle → obstructed aqueous outflow → rapid IOP rise → optic nerve damage, vision loss.

Medication Classes to AVOID

Safer Alternatives (Consult Your Doctor First)

• 2nd-gen antihistamines: Loratadine, Cetirizine, Fexofenadine (minimal anticholinergic).
• Intranasal corticosteroids: Fluticasone, Mometasone (no systemic mydriasis).
• Saline nasal irrigation.
• Acetaminophen for pain/fever.
• Guaifenesin (expectorant) — no pupil effect.

Glaucoma Management Basics

• Prophylactic laser peripheral iridotomy (LPI) creates alternative drainage pathway.
• Chronic IOP-lowering drops (prostaglandins, beta-blockers, alpha-agonists, CAIs).
• Regular ophthalmology follow-up.

Always inform every prescriber and pharmacist of your glaucoma diagnosis. Carry a medication alert card.

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Class	Examples	Mechanism
Antihistamines (1st gen)	Diphenhydramine (Benadryl), Chlorpheniramine, Doxylamine	Anticholinergic → mydriasis
Decongestants (oral)	Pseudoephedrine (Sudafed), Phenylephrine	Alpha-agonist → mydriasis + systemic vasoconstriction
Decongestant nasal sprays	Oxymetazoline (Afrin), Phenylephrine	Systemic absorption can cause mydriasis
Tricyclic Antidepressants	Amitriptyline, Nortriptyline, Imipramine	Strong anticholinergic
Anticholinergics (GI, bladder)	Oxybutynin, Scopolamine, Hyoscyamine	Mydriasis
Antispasmodics	Dicyclomine	Anticholinergic
Muscle Relaxants	Cyclobenzaprine	Anticholinergic