Why Medication History Matters in Eye Care
Medications can cause ocular side effects ranging from mild dry eye to serious retinal toxicity. As a CPO, accurately documenting a complete medication and supplement history helps the physician identify drug-related eye findings and avoid interactions with topical treatments. Many patients do not consider supplements, vitamins, or over-the-counter products to be "medications," so you must ask about them explicitly.
What to Document
For every medication and supplement, record:
- Name: generic and brand name when possible
- Dose: the amount taken per administration
- Frequency: how often (once daily, twice daily, as needed)
- Route: oral, topical, injected, inhaled
- Duration: how long they have been taking it
- Reason: the condition it is prescribed for
This level of detail matters because many drug-related ocular toxicities are dose- and duration-dependent.
Medications with Important Ocular Side Effects
| Medication | Ocular Effect | Why It Matters |
|---|---|---|
| Hydroxychloroquine (Plaquenil) | Macular toxicity (bull's eye maculopathy) | Requires annual OCT and visual field screening after 5 years |
| Amiodarone (Cordarone) | Corneal microdeposits (vortex keratopathy) | Usually asymptomatic but can cause halos and glare |
| Tamsulosin (Flomax) and alpha-blockers | Intraoperative floppy iris syndrome (IFIS) | Must be noted before cataract surgery planning |
| Steroids (systemic or topical) | Posterior subcapsular cataract, elevated IOP | Long-term use requires IOP and lens monitoring |
| Topiramate (Topamax) | Acute angle-closure, myopia shift | Can cause sudden vision loss in predisposed patients |
| Ethambutol | Optic neuropathy | Can cause irreversible vision loss; requires monitoring |
Hydroxychloroquine (Plaquenil) is one of the highest-yield medications for the CPO exam. Any patient taking it for lupus or rheumatoid arthritis should have annual OCT and visual field testing. Toxicity risk increases significantly after cumulative doses exceed 1,000 grams.
Supplements and AREDS Formula
Ask about all supplements the patient takes, particularly:
- AREDS2 formula: confirms diagnosis of intermediate or advanced AMD and adherence to evidence-based treatment
- Fish oil/omega-3: used for dry eye management
- Vitamin E and C: antioxidants relevant to AMD and general eye health
- Lutein and zeaxanthin: macular pigment support, found in AREDS2
- Herbal supplements: some interact with anesthesia or affect bleeding time (ginkgo, St. John's wort)
Keep a medication reference card at your workstation with the most common ocular-relevant drugs. When a patient lists an unfamiliar medication, note it for the physician who can identify any eye-related implications during the exam.
Current Eye Drops
All topical ophthalmic medications must be documented separately with:
- Name and concentration (e.g., timolol 0.5%, latanoprost 0.005%)
- Which eye (OD, OS, or OU)
- How many times per day
- How long they have been using them
- Whether the patient actually uses them as prescribed (compliance)
Documenting "eye drops" without the name and concentration. The physician needs to know exactly which drops are being used to assess IOP control, identify potential interactions, and plan treatment adjustments.
Key Takeaways
- Record name, dose, frequency, route, duration, and reason for every medication
- Hydroxychloroquine requires annual OCT and visual field monitoring
- Tamsulosin must be flagged before any planned cataract surgery (IFIS risk)
- Steroids can cause posterior subcapsular cataracts and elevated IOP with long-term use
- Always ask about supplements, vitamins, and herbal products specifically
- Document current eye drops with full details including concentration and compliance