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

Treatment of Pink Eye (Conjunctivitis)

Treatment depends entirely on the underlying cause—most cases are viral and require only supportive care, while bacterial conjunctivitis may benefit from topical antibiotics, and allergic conjunctivitis responds to antihistamines and mast cell stabilizers 1.

Diagnostic Approach

The key is differentiating between the three main types:

Viral Conjunctivitis (most common in adults):

• Watery discharge
• Often bilateral
• May have preauricular lymphadenopathy
• Burning, gritty sensation
• Associated with upper respiratory infection

Bacterial Conjunctivitis (more common in children):

• Mucopurulent discharge
• Eyelids matted shut on waking
• Lack of itching
• No history of recurrent conjunctivitis
• Unilateral or bilateral

Allergic Conjunctivitis:

• Bilateral itching (hallmark symptom)
• Watery discharge
• Seasonal pattern
• Eyelid edema, chemosis
• Papillary reaction on palpebral conjunctiva

2, 3

Treatment by Type

Viral Conjunctivitis

No antibiotics needed—this is self-limited and resolves in 1-2 weeks 1, 3.

Supportive care:

• Preservative-free artificial tears
• Cold compresses
• Topical antihistamine drops for symptomatic relief
• Strict hand hygiene to prevent transmission

Critical: Patients are contagious for 7-14 days from symptom onset. Advise frequent handwashing with soap and water (not just sanitizer), separate towels/pillows, and avoid close contact. Healthcare workers and childcare providers should stay home during the contagious period 1.

Bacterial Conjunctivitis

Most uncomplicated cases are self-limited, resolving in 1-2 weeks without treatment 3, 4. However, antibiotics modestly improve outcomes:

• Clinical cure increases by 26% with antibiotics versus placebo (68% vs 56% resolution by days 4-9) 4
• Microbiological cure increases by 53% 4
• Allows earlier return to work/school 1

Antibiotic options (topical):

• Fluoroquinolones (besifloxacin, moxifloxacin, levofloxacin)
• Trimethoprim-polymyxin B
• Azithromycin
• Erythromycin ointment

No significant difference exists between fluoroquinolones and non-fluoroquinolones for efficacy 4. Consider delayed prescribing—give prescription but advise waiting 2-3 days to see if symptoms improve spontaneously 2.

Exceptions requiring immediate systemic antibiotics:

Gonococcal conjunctivitis:

• Ceftriaxone 1g IM single dose (adults)
• Plus azithromycin 1g PO single dose for concurrent chlamydia 1

Chlamydial conjunctivitis:

• Azithromycin 1g PO single dose OR
• Doxycycline 100mg PO twice daily for 7 days 1

Contact lens wearers: Always treat with antibiotics and refer to ophthalmology to rule out corneal ulcer 2, 5.

Allergic Conjunctivitis

First-line: Topical antihistamines with mast cell-stabilizing activity 1, 2.

Stepwise approach:

1. Environmental modification: Remove allergens, cool compresses, preservative-free artificial tears
2. Topical dual-action agents: Olopatadine, ketotifen (antihistamine + mast cell stabilizer)
3. Topical mast cell stabilizers alone: Nedocromil, lodoxamide
4. Short-term topical corticosteroids for severe exacerbations (monitor IOP and cataracts) 1
5. Topical cyclosporine 0.05-0.1% for refractory cases 1

For severe vernal or atopic keratoconjunctivitis, topical tacrolimus 0.03-0.1% may be used off-label 1.

Neonatal Conjunctivitis (Ophthalmia Neonatorum)

All neonates require immediate evaluation and treatment:

Prophylaxis at birth: Erythromycin 0.5% ointment single application 1

If infection develops:

• Gonococcal: Ceftriaxone 25-50 mg/kg IV/IM (max 250mg) single dose 1
• Chlamydial: Erythromycin 50 mg/kg/day PO divided four times daily for 14 days OR azithromycin 20 mg/kg/day PO for 3 days 1

Red Flags Requiring Ophthalmology Referral

Refer immediately if:

• Neonate with conjunctivitis
• Severe eye pain
• Decreased vision
• Recent ocular surgery
• Vesicular rash on eyelids or nose (herpes zoster ophthalmicus)
• Contact lens wearer
• Immunocompromised state
• History of rheumatologic disease
• Suspected gonococcal or chlamydial infection 2

Common Pitfalls

Don't prescribe antibiotics reflexively for all red eyes—viral conjunctivitis is most common and antibiotics provide no benefit while contributing to resistance 3, 4.

Don't miss sexually transmitted infections—gonococcal and chlamydial conjunctivitis require systemic treatment and partner notification 1.

Don't use topical corticosteroids without monitoring—check baseline and periodic IOP and perform dilated exam for cataracts 1.

Don't forget to address underlying conditions—dry eye and blepharitis are the most common causes of chronic conjunctival inflammation and require specific treatment 1.