What is the recommended treatment for pink eye (conjunctivitis)?

Treatment of Pink Eye (Conjunctivitis)

Treatment depends entirely on identifying the specific type of conjunctivitis, as viral, bacterial, and allergic forms require fundamentally different approaches—most cases are viral and self-limited, requiring only supportive care, while bacterial cases may benefit from topical antibiotics to shorten duration, and allergic cases respond to antihistamines. 1

Initial Diagnostic Approach

The key clinical features that differentiate conjunctivitis types include:

• Bacterial conjunctivitis: Mucopurulent discharge with eyelids matted shut upon waking, lack of itching, no prior history of conjunctivitis 2, 3
• Viral conjunctivitis: Watery discharge, burning/gritty sensation, often bilateral with preauricular lymphadenopathy 2, 3
• Allergic conjunctivitis: Bilateral itching (most consistent sign), watery discharge, seasonal pattern 2, 3

Treatment by Type

Viral Conjunctivitis (Most Common Overall)

Viral conjunctivitis requires only supportive care in most cases, as it is self-limited and resolves without specific treatment. 1, 2

• Supportive measures: Artificial tears, cold compresses, topical antihistamines for symptom relief 2, 4
• Strict hand hygiene is essential to prevent transmission 1, 2
• Follow-up at 2-3 weeks if symptoms persist (red eye, pain, decreased vision) 1
• Monitor for subepithelial infiltrates starting 1+ weeks after onset; treat with topical corticosteroids (fluorometholone or loteprednol) only if causing blurred vision or photophobia 1

Special viral cases requiring treatment:

• Herpes simplex virus (HSV): Topical ganciclovir 0.15% gel 3-5 times daily OR trifluridine 1% solution 5-8 times daily; oral antivirals (acyclovir 200-400mg 5x/day, valacyclovir 500mg 2-3x/day, or famciclovir 250mg twice daily) 1

  • Avoid topical corticosteroids as they potentiate HSV infections 1
  • Neonates require urgent pediatric consultation due to life-threatening systemic infection risk 1

• Varicella zoster virus (VZV): Topical antibiotics to prevent secondary bacterial infection; oral antivirals for persistent disease (acyclovir 800mg 5x/day for 7 days, valacyclovir 1000mg q8h for 7 days, or famciclovir 500mg 3x/day for 7 days) 1

Bacterial Conjunctivitis

Mild bacterial conjunctivitis is self-limited and resolves spontaneously in immunocompetent adults, but topical antibiotics shorten duration by 2-5 days and allow earlier return to school/work. 1, 5

• Mild cases: 5-7 day course of broad-spectrum topical antibiotic (choice based on convenience/cost, as no single agent shows superiority) 1

  • Delayed antibiotic prescribing achieves similar symptom control as immediate prescribing 2
  • Povidone-iodine 1.25% ophthalmic solution is an alternative when antibiotic access is limited 1

• Moderate to severe cases (copious purulent discharge, pain, marked inflammation): Obtain conjunctival cultures and Gram stain if gonococcal infection suspected; empiric broad-spectrum antibiotics while awaiting results 1

  • Consider methicillin-resistant Staphylococcus aureus (MRSA), especially in nursing home residents 1
  • Re-evaluate in 3-4 days if no improvement 1

Special bacterial cases requiring systemic treatment:

• Gonococcal conjunctivitis: Requires parenteral antibiotics; hospitalization mandatory for neonates 1

• Chlamydial conjunctivitis: Systemic antibiotics required (>50% of infants have infection at other sites); topical therapy alone is inadequate 1

  • Sexual contacts must be treated simultaneously 1
  • Consider child abuse in pediatric cases 1
  • Re-evaluate after treatment due to 19% treatment failure rate 1

• Contact lens wearers: Always treat with antibiotics and refer to ophthalmology to evaluate for corneal ulcers 2, 6

Allergic Conjunctivitis

Topical antihistamines with mast cell-stabilizing activity are the treatment of choice for allergic conjunctivitis. 2, 3

• First-line: Dual-acting topical agents (antihistamine + mast cell stabilizer) 4
• Adjunctive measures: Artificial tears, cold compresses, allergen avoidance 4
• Systemic antihistamines can be added for additional symptom control 6

Red Flags Requiring Ophthalmology Referral

Refer immediately for: 1, 2

• Visual loss
• Moderate to severe pain
• Severe purulent discharge
• Corneal involvement
• Conjunctival scarring
• Lack of response to therapy
• Recurrent episodes
• History of HSV eye disease
• Immunocompromised state
• Neonatal conjunctivitis
• Recent ocular surgery
• Vesicular rash on eyelids/nose

Common Pitfalls

• Do not use topical corticosteroids for HSV conjunctivitis—they worsen epithelial infections 1
• Rule out infectious causes before immunosuppression in suspected vasculitis cases 1
• Monitor intraocular pressure and cataracts in patients on prolonged topical corticosteroids 1
• Trifluridine causes epithelial toxicity if used >2 weeks; ganciclovir is less toxic 1
• Children with bacterial conjunctivitis should be evaluated for concurrent otitis media 1