38.2 Ocular Anti-inflammatories and Anti-infectives

Ocular Anti-inflammatories and Anti-infectives

Ocular anti-inflammatory and anti-infective medications treat inflammation and infections of the eye. These drugs are a core part of ophthalmic nursing because improper use can lead to vision loss, resistant infections, or serious side effects like elevated intraocular pressure. This section covers the major drug classes, their mechanisms, and the nursing skills needed to administer them safely.

Ocular Anti-inflammatory and Anti-infective Medications

Ocular Anti-inflammatory Medications

These drugs reduce inflammation, pain, and swelling in the eye. Common conditions that call for them include uveitis, keratitis, and post-operative inflammation after eye surgery.

Two main subclasses are used:

• Corticosteroids (prednisolone, dexamethasone): the most potent option for ocular inflammation. They suppress the immune response by inhibiting production of pro-inflammatory mediators like prostaglandins and leukotrienes.
• NSAIDs (diclofenac, ketorolac): reduce inflammation specifically by inhibiting cyclooxygenase (COX) and blocking prostaglandin synthesis. Often chosen for post-operative pain and allergic conjunctivitis when corticosteroid risks are a concern.

Ocular Anti-infective Medications

These drugs treat or prevent bacterial, viral, or fungal infections such as conjunctivitis, keratitis, and endophthalmitis. The choice of drug depends on the causative organism:

• Antibiotics (tobramycin, moxifloxacin): target bacterial infections by inhibiting bacterial growth or directly killing bacteria. Fluoroquinolones like moxifloxacin are frequently used because of their broad-spectrum coverage.
• Antivirals (trifluridine, ganciclovir): interfere with viral DNA replication. Primary uses include herpes simplex keratitis and cytomegalovirus (CMV) retinitis.
• Antifungals (natamycin, amphotericin B): disrupt fungal cell membranes or inhibit ergosterol synthesis. Fungal keratitis is the most common indication, and natamycin is typically the first-line agent.

Dosage Forms

All of these medications are available as topical formulations designed for direct application to the eye or surrounding tissues, including eye drops, ointments, and gels. Topical delivery allows targeted drug concentration at the site while minimizing systemic absorption.

Indications, Mechanisms, and Side Effects

A few things to flag for exams:

• Corticosteroid side effects are the most heavily tested. Elevated IOP can lead to steroid-induced glaucoma, and prolonged use increases cataract risk. Patients on long-term ophthalmic corticosteroids need regular IOP monitoring.
• NSAIDs are generally safer than corticosteroids for mild inflammation, but they don't suppress the immune response as effectively.
• Antibiotic resistance is a real concern. Never use ophthalmic antibiotics longer than prescribed, and always complete the full course.

Nursing Considerations

Proper technique during administration directly affects drug effectiveness and patient safety. Follow these steps:

1. Assess and verify. Review the patient's eye condition and the medication order. Confirm the right patient, right drug, right eye (OD, OS, or OU), right dose, and right route.
2. Explain the procedure to the patient to promote cooperation. Many patients are anxious about anything near their eyes.
3. Perform hand hygiene and don gloves to maintain aseptic technique.
4. Check the medication label for name, strength, expiration date, and which eye is specified.
5. Inspect the solution for discoloration or particulate matter. Do not use if either is present.
6. Position the patient with head tilted back and eyes looking upward.
7. Gently pull down the lower eyelid to create a conjunctival pocket.
8. Instill drops or apply ointment into the lower conjunctival sac. Keep the dropper tip away from the eye and surrounding tissues to prevent contamination.
9. Instruct the patient to close the eye gently and apply light pressure over the nasolacrimal duct (inner corner of the eye) for 1–2 minutes. This step is critical because it reduces systemic absorption through the nasal mucosa.
10. Wait at least 5 minutes between different eye medications to prevent dilution or drug interactions.
11. Document the medication, time, dose, eye treated, and patient response.

Patient Education Strategies

Patients often struggle with self-administering eye medications at home. Effective teaching makes a real difference in treatment outcomes.

• Demonstrate proper technique before discharge. Have the patient do a return demonstration. Key points to reinforce: wash hands before and after, avoid touching the dropper tip to the eye, and apply nasolacrimal pressure after instilling drops.
• Stress completing the full course, even after symptoms improve. Stopping antibiotics early promotes resistant organisms. Stopping corticosteroids abruptly can cause rebound inflammation.
• Explain storage requirements. Some drops need refrigeration; others must be protected from light. Patients should check the label and discard expired medications.
• Teach warning signs that require prompt medical attention: increasing redness, purulent discharge, worsening pain, or any change in vision.
• Counsel on preventing infection spread. Patients should avoid sharing towels, pillowcases, or eye makeup. Contact lenses should not be worn during treatment for infection unless the provider specifically says otherwise.
• Advise reporting side effects like persistent stinging, burning, or signs of allergic reaction (swelling, itching, rash around the eye) so the provider can adjust treatment.
• Provide written instructions to reinforce verbal teaching. Patients retain more when they have something to reference at home.