Which medications are contraindicated in patients with glaucoma?

Contraindicated Medications in Glaucoma

The specific drugs contraindicated in glaucoma depend critically on the type of glaucoma: anticholinergics, adrenergic agents, sulfonamides, antidepressants, and topiramate are contraindicated in angle-closure glaucoma, while sulfonamide-containing carbonic anhydrase inhibitors are contraindicated in patients with sulfonamide allergy regardless of glaucoma type.

Critical Distinction: Type of Glaucoma Matters

The question of contraindications in glaucoma cannot be answered without distinguishing between open-angle glaucoma and angle-closure glaucoma—these are fundamentally different diseases with opposite contraindication profiles.

Angle-Closure Glaucoma: Multiple Drug Contraindications

For patients with primary angle-closure disease (PACD), including those with narrow angles, the following medication classes are contraindicated 1, 2, 3:

Medications Causing Pupillary Block (Classic Mechanism)

• Anticholinergics: Including over-the-counter cold/flu medications, allergy medications, sleeping aids, motion-sickness medications, and prescription psychoactive drugs 1, 2
• Adrenergic agents:
  • Topical: phenylephrine drops, nasal ephedrine, nebulized salbutamol
  • Systemic: decongestants, epinephrine 2, 3
• Tricyclic and tetracyclic antidepressants 2, 4
• Selective serotonin reuptake inhibitors (SSRIs) 4, 3
• Antihistamines (H1 and H2 receptor antagonists) 4
• Cholinergic agents (paradoxically, including pilocarpine) 2

Medications Causing Non-Pupillary Block (Ciliary Body Edema)

• Sulfonamide-based drugs:
  • Topiramate (most common culprit)
  • Hydrochlorothiazide
  • Acetazolamide
  • Cotrimoxazole 2, 3

Critical distinction: Sulfonamide-induced angle closure presents bilaterally with ciliary body edema and anterior rotation of the iris-lens diaphragm. Iridotomy is NOT effective for this mechanism—only medication discontinuation works 2, 3.

Open-Angle Glaucoma: Minimal Systemic Contraindications

For primary open-angle glaucoma, there are essentially no absolute systemic medication contraindications 5. The main concern is:

• Corticosteroids: Can increase aqueous humor resistance through the trabecular meshwork, elevating IOP 6, 4

Contraindications for Glaucoma Medications Themselves

When treating glaucoma, certain medications have specific contraindications 7:

• Carbonic anhydrase inhibitors (topical and oral):

  • Sulfonamide allergy (absolute contraindication)
  • Kidney stones
  • Aplastic anemia
  • Sickle cell disease 7

• Beta-blockers: Relative contraindications include obstructive airway disease and cardiac conduction abnormalities, though cardioselective agents (betaxolol) minimize pulmonary risks 7

Clinical Pitfalls

Common mistake: Patients with PACS who haven't undergone laser peripheral iridotomy should be explicitly warned about medications with anticholinergic properties 1. About 20% of PACD patients receive potentially contraindicated medications, often due to polypharmacy 8.

Time-to-onset varies: Sulfonamide-induced AACG typically occurs shortly after treatment initiation or dose escalation, while other mechanisms may vary 3.

Botulinum toxin: Periocular botulinum toxin can diffuse to the ciliary ganglion, inhibiting the pupillary sphincter and causing angle closure 2.