Medication & Supplement History for the CPOA Exam

HistoryPharmacologyCPOA

A complete medication history is an essential part of every ophthalmic visit. Many common systemic and topical medications have significant ocular effects, and herbal supplements can interact with treatments. As a CPOA, accurately documenting all medications ensures the physician has a complete picture of the patient's health status and potential drug-related eye conditions.

Types of Medications to Document

Ask about all of the following categories:

Prescription medications: Both systemic (taken by mouth, injection, or other routes) and topical eye drops.
Over-the-counter (OTC) medications: Aspirin, NSAIDs (ibuprofen, naproxen), antihistamines, decongestants.
Herbal supplements and vitamins: Fish oil, ginkgo biloba, vitamin E, AREDS vitamins, St. John's Wort.
Recreational substances: Tobacco, alcohol, cannabis (marijuana).

For each medication, document the name, dose, frequency, route of administration, and duration of use.

Medications with Significant Ocular Effects

Several common medications require specific monitoring or have notable ocular side effects:

Medication	Use	Ocular Effect
Hydroxychloroquine (Plaquenil)	Lupus, rheumatoid arthritis	Retinal toxicity (bull's-eye maculopathy); requires annual OCT monitoring
Corticosteroids (systemic or topical)	Inflammation	Posterior subcapsular cataracts, elevated IOP
Tamsulosin (Flomax)	Benign prostatic hyperplasia	Intraoperative floppy iris syndrome (IFIS) during cataract surgery
Amiodarone	Cardiac arrhythmia	Corneal verticillata (whorl-like corneal deposits), optic neuropathy
Isotretinoin (Accutane)	Acne	Dry eye, decreased night vision, pseudotumor cerebri risk
Phenothiazines (thioridazine)	Antipsychotic	Pigmentary retinopathy, lens deposits
Ethambutol	Tuberculosis	Optic neuropathy, color vision deficiency
Anticoagulants (warfarin, apixaban)	Blood clots, atrial fibrillation	Increased subconjunctival and vitreous hemorrhage risk; surgical management

Hydroxychloroquine is one of the most important medications to identify and document. Patients taking it for lupus or rheumatoid arthritis need annual baseline OCT and visual field testing to detect early retinal toxicity before vision is affected. The risk increases significantly with cumulative dose and duration of use.

Supplements and Herbal Preparations

Patients often do not consider supplements "medications" and fail to mention them unless specifically asked. Clinically relevant supplements in eye care include:

AREDS2 vitamins: Prescribed for intermediate AMD to slow progression.
Fish oil/omega-3 fatty acids: Used for dry eye disease; also act as mild anticoagulants.
Ginkgo biloba and vitamin E: Have anticoagulant properties; relevant before surgery.
Melatonin: May slightly lower IOP; occasionally discussed in glaucoma.

Documenting Allergies

Every medication history must include a thorough allergy review. For each reported allergy, document:

The name of the drug or substance
The type of reaction (rash, hives, swelling, anaphylaxis, nausea)
Whether it is a true allergy (immune-mediated) or an adverse reaction (side effect)

This distinction matters because a patient who reports "allergy to penicillin" due to nausea can usually safely receive other medications in that class, while a patient who had anaphylaxis cannot.

Key Takeaways

Document all medications: prescription, OTC, supplements, and recreational substances.
Key medications with ocular effects include hydroxychloroquine (retinal toxicity), corticosteroids (cataracts, elevated IOP), and tamsulosin (IFIS).
Supplements often act as anticoagulants and may affect surgical planning.
Allergy documentation must include the specific drug and the type of reaction; distinguish true allergies from adverse reactions.
Ask specifically about supplements, as patients often do not consider them medications.

Frequently Asked Questions

Why is hydroxychloroquine monitoring so important in eye care?

Hydroxychloroquine (Plaquenil) is a commonly prescribed medication for systemic lupus erythematosus and rheumatoid arthritis. With long-term use, it accumulates in the retinal pigment epithelium and can cause a characteristic bull's-eye pattern of macular toxicity. Early toxicity is detectable with OCT and automated visual field testing before the patient notices vision symptoms. Once significant toxicity occurs, it can be irreversible and continue to progress even after the drug is stopped. The American Academy of Ophthalmology recommends annual retinal screening beginning after 5 years of use (or sooner for high-risk patients) to detect toxicity before it affects vision.

What is IFIS and which medication causes it?

Intraoperative floppy iris syndrome (IFIS) is a complication during cataract surgery caused by systemic alpha-1A adrenergic receptor blockers, most commonly tamsulosin (Flomax), used to treat benign prostatic hyperplasia. These drugs relax smooth muscle in the iris dilator, causing the iris to be poorly dilated, billowing, and prone to prolapsing through cataract surgery incisions. The effect is permanent even after the drug is stopped. Cataract surgeons must be alerted to a patient's history of tamsulosin use so they can modify surgical technique (larger dilating devices, viscoelastics) to prevent iris prolapse.

Why should a CPOA ask specifically about herbal supplements?

Patients frequently do not consider herbal supplements, vitamins, or OTC products to be 'medications' and will not volunteer this information unless specifically asked. Many herbal supplements have pharmacological effects relevant to eye care. Fish oil, ginkgo biloba, vitamin E, and vitamin C in high doses can inhibit platelet aggregation, increasing the risk of intraoperative and postoperative bleeding. This is particularly relevant before cataract or other eye surgeries, as some supplements may need to be stopped beforehand. Melatonin and several herbal preparations also interact with anesthetics.

What is the difference between a drug allergy and an adverse drug reaction?

A drug allergy is an immune-mediated response to a medication. The immune system produces antibodies (IgE for immediate/anaphylactic reactions) or activates other immune pathways against the drug. Reactions include hives, angioedema, anaphylaxis, Stevens-Johnson syndrome, and serum sickness. An adverse drug reaction (ADR) is any unwanted effect of a drug that is not immune-mediated. Examples include nausea, dizziness, constipation, and dry mouth. ADRs are common, dose-dependent, and predictable. True allergies are less common but can be severe or life-threatening. The distinction matters because a cross-reactive allergy excludes entire drug classes, while an ADR typically only affects tolerability, not safety.

How should corticosteroid use be documented and why is it relevant to eye care?

When documenting corticosteroid use, record the specific drug name (prednisone, prednisolone, dexamethasone, topical triamcinolone, etc.), the dose, route of administration (oral, inhaled, topical skin, ophthalmic), and the duration of use. Prolonged or high-dose corticosteroid use, by any route, is associated with posterior subcapsular cataracts and elevated intraocular pressure (steroid-induced glaucoma). Even inhaled corticosteroids used for asthma can cause these effects with long-term use. This information helps the physician interpret an unexplained cataract or elevated IOP and may alter treatment decisions.