What is the appropriate management for pink eye (conjunctivitis)?

Management of Pink Eye (Conjunctivitis)

Initial Approach: Avoid Indiscriminate Antibiotic Use

Most conjunctivitis cases are self-limited and do not require antibiotics—viral conjunctivitis will not respond to antibacterial agents, and mild bacterial conjunctivitis typically resolves spontaneously without treatment. 1

The key is differentiating the etiology through clinical presentation rather than reflexively prescribing antibiotics.

Diagnostic Differentiation

Viral Conjunctivitis (Most Common Overall)

• Watery discharge, burning/gritty sensation, often bilateral 2, 3
• May have preauricular lymphadenopathy
• Highly contagious for 7-14 days from symptom onset 1
• Management: Supportive care only—artificial tears, cold compresses, topical antihistamines for comfort 2
• Strict hand hygiene, separate towels, avoid close contact during contagious period 1

Bacterial Conjunctivitis (Second Most Common)

• Mucopurulent discharge with eyelids matted shut upon waking 2, 3
• Lack of itching, no history of recurrent conjunctivitis 3
• More common in children 2

For mild bacterial conjunctivitis: Observation without antibiotics is appropriate, as 55.5% resolve spontaneously by days 4-9 4. If antibiotics are used, they increase clinical cure by only 26% (from 55.5% to 68.2%) 4. Consider delayed prescribing strategy—provide prescription but advise waiting 2-3 days before filling if no improvement 2.

For moderate-to-severe bacterial conjunctivitis (copious purulent discharge, pain, marked inflammation): Use empiric broad-spectrum topical antibiotic for 5-7 days—no specific agent is superior, so choose the most convenient or least expensive option 1. Povidone-iodine 1.25% ophthalmic solution is an alternative when antibiotic access is limited 1.

Allergic Conjunctivitis

• Bilateral itching (most consistent sign), watery discharge, chemosis, eyelid edema 5, 3
• Seasonal pattern often present
• Management: Topical antihistamines with mast cell-stabilizing activity are first-line 2, 3
• Artificial tears and cold compresses for additional relief 6

Critical Red Flags Requiring Immediate Ophthalmology Referral

Refer urgently if any of the following are present 1:

• Visual loss or decreased vision
• Moderate to severe pain (not just irritation)
• Corneal involvement (opacity, infiltrate)
• Severe purulent discharge suggesting gonococcal infection
• Conjunctival scarring
• History of herpes simplex virus eye disease
• Recent ocular surgery
• Vesicular rash on eyelids or nose (herpes zoster)
• Immunocompromised state
• Neonatal conjunctivitis (requires hospitalization) 1

Special Situations Requiring Systemic Treatment

Gonococcal Conjunctivitis

• Hyperacute, vision-threatening, requires immediate systemic antibiotic therapy (see infectious disease guidelines for dosing) 1
• Obtain conjunctival cultures and Gram stain before treatment 1
• Daily follow-up until resolution 1
• Treat sexual partners; consider sexual abuse in children 1

Chlamydial Conjunctivitis

• Requires systemic antibiotics in addition to topical therapy 3
• Treat sexual partners; consider sexual abuse in children 1

Herpes Zoster Conjunctivitis

• Oral antivirals indicated: acyclovir 800 mg five times daily for 7 days, valacyclovir 1000 mg every 8 hours for 7 days, or famciclovir 500 mg three times daily for 7 days 1
• May need topical antibiotics to prevent secondary bacterial infection from vesicle necrosis 1

Contact Lens Wearers

• Always treat with topical antibiotics and refer to ophthalmology to evaluate for corneal ulcer 7
• Risk of Pseudomonas and other serious pathogens

Prevention Strategies

• Herpes zoster vaccination strongly recommended for patients ≥50 years and immunocompromised patients ≥19 years 1
• Neonatal prophylaxis: 0.5% erythromycin ophthalmic ointment at birth 1
• Hand hygiene education for infectious cases to prevent community spread 1

Common Pitfalls to Avoid

• Do not prescribe topical corticosteroids without ophthalmology consultation—can worsen herpes simplex keratitis and bacterial/fungal infections 1
• Do not assume all purulent discharge is bacterial—severe viral conjunctivitis can also produce discharge
• Do not miss gonococcal conjunctivitis—copious purulent discharge with rapid onset requires emergency treatment 1
• Do not forget to check for systemic associations—conjunctivitis may be the presenting sign of sexually transmitted infections, Kawasaki disease, or autoimmune conditions 1