Which medications are contraindicated in patients with glaucoma?

Medications Contraindicated in Glaucoma

Avoid anticholinergic agents, sympathomimetic drugs, sulfonamide derivatives (including topiramate), and combination products containing bupropion in patients with glaucoma, particularly those with angle-closure disease or narrow anterior chamber angles. 1

Primary Drug Classes to Avoid

Anticholinergic Medications (Highest Risk for Angle-Closure)

• Topical anticholinergic drops (atropine, tropicamide) cause pupillary dilation and can precipitate acute angle-closure attacks 1, 2
• Systemic anticholinergics including tricyclic antidepressants, antihistamines, antiparkinsonian agents, antipsychotic drugs (especially phenothiazines), and antispasmodic medications induce angle narrowing through mydriasis 1, 3, 4
• Benzodiazepine hypnotics were the most commonly prescribed contraindicated medication class in real-world glaucoma patients, with approximately 20% of angle-closure patients receiving potentially harmful drugs 5

Sympathomimetic/Adrenergic Agents

• Topical adrenergic drops (phenylephrine), inhaled bronchodilators (ipratropium bromide, salbutamol-containing inhalers), and nasal decongestants (ephedrine, oxymetazoline) can trigger acute attacks 1, 6, 2
• The American Academy of Otolaryngology-Head and Neck Surgery explicitly warns against oxymetazoline nasal spray in glaucoma patients due to IOP elevation risk and potential retinal vascular occlusion 6
• Systemic epinephrine (used for anaphylaxis) carries angle-closure risk in predisposed individuals 2

Sulfonamide Derivatives (Unique Mechanism)

• Topiramate (Topamax) and other sulfa-based drugs (acetazolamide, hydrochlorothiazide, cotrimoxazole) cause ciliary body edema with anterior rotation of the iris-lens diaphragm—a distinct mechanism from pupillary block 1, 3, 4, 2
• This sulfa-induced angle closure does not respond to peripheral iridotomy, making prevention through drug avoidance critical 2

Specific Antidepressant Contraindications

• Combination products containing bupropion (e.g., naltrexone/bupropion) are explicitly contraindicated in any patient with a history of acute angle-closure glaucoma per diabetes-management guidelines 7
• Tricyclic and tetracyclic antidepressants and monoamine oxidase inhibitors carry angle-closure risk through anticholinergic effects 3, 4, 2

Critical Pre-Treatment Assessment Required

Before prescribing any potentially contraindicated medication, verify that intraocular pressure is adequately controlled and determine whether the patient has undergone iridectomy, as these factors fundamentally alter medication-induced angle-closure risk. 7

Risk Stratification by Glaucoma Type

• Angle-closure disease (primary angle closure suspect, primary angle closure, acute angle-closure crisis): All anticholinergic and sympathomimetic agents pose significant risk 1, 5
• Open-angle glaucoma: Primary concern is corticosteroid-induced IOP elevation rather than angle-closure medications 3, 4
• Post-iridectomy patients: May tolerate some previously contraindicated medications, though individual assessment is essential 7

Mechanism-Based Classification

Pupillary Block Mechanism (Treatable by Iridotomy)

• Anticholinergics and adrenergics cause mydriasis → iris bunching peripherally → trabecular meshwork obstruction → acute IOP spike 2
• Most attacks occur in individuals unaware they have anatomically narrow iridocorneal angles 8, 2

Non-Pupillary Block Mechanism (Iridotomy Ineffective)

• Sulfonamides cause ciliary body swelling → forward lens-iris displacement → angle closure without pupillary involvement 1, 2

Additional Medications Requiring Caution

Cholinergic Agents (Paradoxical Risk)

• Pilocarpine can paradoxically cause angle closure in certain anatomic configurations despite being a miotic 2

Botulinum Toxin

• Periocular botulinum toxin can diffuse to the ciliary ganglion, inhibiting the pupillary sphincter and precipitating angle closure 3, 2

Anticoagulants

• Listed as potential precipitants of acute angle-closure glaucoma, though mechanism is less well-defined 8, 2

Common Clinical Pitfalls

Do not assume over-the-counter medications are safe—nasal decongestants and antihistamines available without prescription carry significant angle-closure risk through systemic absorption 6, 8

Polypharmacy dramatically increases risk—patients receiving multiple medications had significantly higher rates of contraindicated drug exposure (median number of prescriptions was significantly higher in those receiving contraindicated drugs, p=0.010) 5

Review all medication routes—inhaled bronchodilators, nasal sprays, and topical preparations can cause systemic effects sufficient to trigger angle closure 1, 2

Management When Contraindicated Drugs Are Prescribed

• Approximately 25% of patients with acute primary angle closure had routinely received contraindicated medications prior to their attack 5
• If the underlying disease allows discontinuation, stopping the offending agent usually normalizes IOP 4
• When continuation is medically necessary, consider prophylactic laser peripheral iridotomy in angle-closure suspects before initiating therapy 2
• Clinicians should always review medications in patients presenting with acute angle-closure symptoms 8