Systemic drugs that harm the eye
- Drugs and toxicity
Many common drugs affect the eye, from harmless corneal deposits to blindness. Knowing which ones guides screening and questions.
See it in 3D: Lens · Macula · Optic nerve · Cornea
What it is
Many systemic drugs reach the eye. Some effects are harmless and expected; others are sight-threatening and need screening or a change of drug. The general doctor prescribes most of these drugs and is often the first to hear the symptoms, so knowing the main associations is part of safe prescribing.
What to know
- Corticosteroids: cataract and glaucoma.
- Hydroxychloroquine and chloroquine: retinal toxicity (bull's-eye maculopathy).
- Ethambutol and linezolid: optic neuropathy.
- Topiramate and other sulfa drugs: bilateral acute angle closure and a myopic shift.
- Tamsulosin: floppy iris during cataract surgery.
- Vigabatrin: permanent constriction of the visual field.
Systemic drugs and their eye effects
| Drug | Eye effect | What to do |
|---|---|---|
| Corticosteroids | Cataract, raised eye pressure | Periodic pressure and lens checks |
| Hydroxychloroquine | Maculopathy | Baseline exam and yearly screening after 5 years |
| Ethambutol | Optic neuropathy | Acuity and colour vision checks; stop if they fall |
| Amiodarone | Corneal deposits (harmless); rarely optic neuropathy | Ask about visual loss |
| Topiramate | Bilateral angle closure, myopic shift | Stop the drug; emergency if painful |
| Tamsulosin | Floppy iris during cataract surgery | Tell the eye surgeon |
| Isotretinoin | Dry eye, reduced night vision | Lubricants; caution with contact lenses |
| Vigabatrin | Visual field constriction | Field monitoring |
Toxicity and risks
- Anticholinergic and sympathomimetic drugs (antihistamines, antidepressants, decongestants, nebulised bronchodilators) can trigger angle closure in eyes with narrow angles.
- Digoxin toxicity can cause yellow vision; phosphodiesterase inhibitors can tint vision blue.
- Some drug effects persist or progress after stopping, which is why baseline exams matter.
Next step / Initial management
- Before starting hydroxychloroquine, ethambutol or vigabatrin: baseline eye assessment.
- New visual symptoms on any of these drugs: ophthalmology, and consider stopping the drug with the prescriber.
- Painful red eye with halos after starting topiramate: emergency (angle closure).
- Tell patients on tamsulosin to mention it before cataract surgery.
Test yourself
Think of the answer, then tap the question to see it.
Which antiepileptic can cause bilateral acute angle closure?
Topiramate, through swelling of the ciliary body.
Why should a patient tell the eye surgeon about tamsulosin?
Because it causes a floppy iris during cataract surgery, which the surgeon must plan for.
Which drug causes permanent visual field constriction?
Vigabatrin.
Connections
See it in 3D4
The structures of Durgical's 3D anatomy where it is found.
Educational content; not a clinical guideline and no substitute for assessment by a health professional. For sudden visual loss, severe eye pain, a chemical burn or an eye injury, go to an emergency department at once.
Sources: Chloroquine and Hydroxychloroquine Toxicity (StatPearls Publishing (NCBI Bookshelf), 2024); Ethambutol (StatPearls Publishing (NCBI Bookshelf), 2024); Amiodarone (StatPearls Publishing (NCBI Bookshelf), 2023); Vigabatrin (StatPearls Publishing (NCBI Bookshelf), 2024); Steroid-Induced Glaucoma (StatPearls Publishing (NCBI Bookshelf), 2026).
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Representative model, for educational purposes only.