Why Anti-Inflammatory and Antibiotic Drops Are Important
Anti-inflammatory and antibiotic ophthalmic agents are among the most commonly prescribed eye drops across all types of eye care practices. The CPOA regularly assists patients using these medications and needs to understand their indications, proper instillation, and key safety points -- including the critical warnings that must be communicated.
Corticosteroid (Steroid) Eye Drops
Corticosteroids are the primary anti-inflammatory agents in ophthalmology. They work by suppressing the arachidonic acid cascade, reducing prostaglandin and leukotriene production, and decreasing vascular permeability and leukocyte migration.
Common Topical Corticosteroids
- Prednisolone acetate 1% (Pred Forte): High-potency; standard of care for severe anterior segment inflammation (uveitis, post-cataract surgery)
- Dexamethasone 0.1%: High-potency; available in drop and ointment forms
- Fluorometholone 0.1% (FML): Lower IOP-raising potential; preferred for mild inflammation when steroid-induced IOP elevation is a concern
- Loteprednol etabonate (Lotemax): Designed to have reduced systemic absorption and lower IOP risk; used for dry eye disease, allergy, and post-surgical inflammation
Indications
- Post-cataract surgery inflammation
- Anterior uveitis (iritis)
- Allergic conjunctivitis (mild-to-moderate)
- Corneal graft rejection
- Bacterial keratitis (as adjunct after antibiotic coverage established)
Critical Safety Points
⚠️ Common Mistake: Prescribing or dispensing corticosteroid drops to a patient with a red eye without first ruling out active herpes simplex virus (HSV) corneal infection. Corticosteroids on an active HSV epithelial keratitis can cause catastrophic corneal damage -- the virus spreads explosively when immune surveillance is suppressed. The CPOA should flag any patient with a history of herpetic eye disease to the doctor before steroids are instilled.
- Steroid-induced IOP elevation: Corticosteroids can raise IOP by decreasing trabecular outflow. Approximately 1 in 3 patients is a "steroid responder" who develops elevated IOP on steroids. IOP must be monitored during any prolonged steroid course.
- Posterior subcapsular cataract: Chronic systemic or high-dose topical steroid use can cause PSC cataracts.
- Contraindicated in active HSV keratitis.
NSAID Eye Drops (Non-Steroidal Anti-Inflammatory)
Ophthalmic NSAIDs inhibit cyclooxygenase (COX) enzymes, reducing prostaglandin synthesis without the steroid-related side effects of IOP elevation and cataract formation.
Common agents: ketorolac (Acular, Acuvail), nepafenac (Nevanac), bromfenac (Bromday, Prolensa), diclofenac (Voltaren)
Indications
- Cystoid macular edema prevention after cataract surgery
- Post-surgical pain and inflammation (in combination with steroids)
- Allergic conjunctivitis (ketorolac)
- Seasonal allergic keratoconjunctivitis
Antibiotic Eye Drops
Antibiotic drops treat bacterial infections of the ocular surface and are used prophylactically after surgery.
| Agent | Class | Common Use |
|---|---|---|
| Moxifloxacin (Vigamox), ciprofloxacin (Ciloxan) | Fluoroquinolone | Bacterial conjunctivitis, keratitis, post-surgical prophylaxis |
| Erythromycin ointment | Macrolide | Neonatal prophylaxis, blepharitis, mild conjunctivitis |
| Tobramycin (Tobrex) | Aminoglycoside | Gram-negative bacterial keratitis and conjunctivitis |
| Bacitracin/polymyxin B (Polysporin) | Combined | Blepharitis, lid margin infections |
Key Patient Counseling Points for Antibiotics
- Bacterial conjunctivitis is highly contagious -- counsel patients on handwashing and not sharing towels or pillowcases.
- Complete the full course even if symptoms resolve early -- stopping early risks reinfection and resistance.
- If symptoms worsen significantly, a corneal ulcer (bacterial keratitis) must be ruled out -- same-day evaluation is required.
💡 Clinical Tip: A combination drop containing a corticosteroid and antibiotic (such as tobramycin/dexamethasone = TobraDex, or ciprofloxacin/betamethasone) is sometimes prescribed for mixed bacterial/inflammatory conditions. The CPOA should understand that these combination drops carry the same steroid safety warnings as single-agent steroids.
Key Takeaways
- Corticosteroids: potent anti-inflammatory; risks include steroid IOP response, cataract, and worsening HSV keratitis.
- NSAIDs: anti-inflammatory without steroid-related risks; used for post-surgical inflammation and CME prevention.
- Fluoroquinolone antibiotics are first-line for bacterial keratitis and post-surgical prophylaxis.
- Flag patients with history of HSV keratitis to the doctor before any steroid is considered.
- Monitor IOP during prolonged steroid courses for steroid-responder elevation.
- Counsel antibiotic patients on hygiene (contagiousness), full course completion, and when to return urgently.