What eye drops are recommended for treating pink eye (conjunctivitis)?

Eye Drops for Pink Eye (Conjunctivitis)

Treatment Based on Type of Conjunctivitis

The choice of eye drops depends entirely on whether the conjunctivitis is viral, bacterial, or allergic—each requires a different approach, with bacterial cases benefiting from topical antibiotics while viral cases need only supportive care. 1

Viral Conjunctivitis (Most Common in Adults)

• Supportive care only—no antibiotics needed: Use artificial tears, cold compresses, and antihistamine eye drops for symptom relief 1
• Viral conjunctivitis accounts for 80% of acute conjunctivitis cases, with adenovirus being the most common causative agent 2
• Watery discharge is the hallmark presentation 1
• Strict handwashing and surface sanitization are critical to prevent the highly contagious spread 2
• One recent 2025 study showed that tobramycin-dexamethasone combination drops after povidone-iodine provided faster symptom relief by day 3 compared to artificial tears, though outcomes were similar by day 7 3
• However, this approach is not standard practice and should be reserved for severe cases given the risks of steroid use in undiagnosed infections 3

Bacterial Conjunctivitis (More Common in Children)

For bacterial conjunctivitis with mucopurulent discharge and matted eyelids, topical antibiotics are indicated, though delayed prescribing (watchful waiting) achieves similar outcomes to immediate treatment. 1

First-Line Antibiotic Options:

• Azithromycin 1.5% eye drops: Twice daily for 3 days—provides faster clinical cure (47.1% by day 3) compared to tobramycin and has better compliance with convenient dosing 4
• Moxifloxacin 0.5% ophthalmic solution: Three times daily for 7 days—achieves 81% complete resolution by 48 hours, significantly faster than polymyxin B/trimethoprim (44% resolution) 5, 6
• Polymyxin B sulfate/trimethoprim: Four times daily for 7 days—effective but slower onset and requires more frequent dosing 5

Special Considerations for Bacterial Conjunctivitis:

• Moxifloxacin is particularly effective against both Gram-positive and Gram-negative ocular isolates, including resistant species 6
• Azithromycin eradicates causative pathogens including resistant species with 89.8% resolution rate 4
• Both azithromycin and moxifloxacin are well-tolerated with minimal adverse events (mainly mild eye irritation) 4, 6

Allergic Conjunctivitis

• Topical antihistamines with mast cell-stabilizing activity are the treatment of choice 1
• First-line supportive measures include cool compresses, preservative-free artificial tears, and antihistamines 7
• For moderate to severe cases, topical cyclosporine 0.05-0.1% can be used as second-line treatment 7

Gonococcal and Chlamydial Conjunctivitis (Requires Systemic Treatment)

These sexually transmitted infections require systemic antibiotics, not just topical eye drops: 8

• Gonococcal conjunctivitis: Ceftriaxone 25-50 mg/kg IV or IM (single dose, max 250 mg) for children ≤45 kg; standard adult dosing for those >45 kg 8
• Chlamydial conjunctivitis: Azithromycin 1 g orally (single dose) or doxycycline 100 mg orally twice daily for 7 days 8
• Pregnant patients: Azithromycin 1 g orally (single dose) or amoxicillin 500 mg orally three times daily for 7 days—avoid doxycycline and quinolones 8

Neonatal Conjunctivitis (Ophthalmia Neonatorum)

• Prophylaxis at birth: Erythromycin 0.5% ophthalmic ointment in each eye as single application 8
• Treatment of gonococcal ophthalmia neonatorum: Ceftriaxone 25-50 mg/kg IV or IM (single dose, max 250 mg) 8
• Treatment of chlamydial ophthalmia neonatorum: Erythromycin base or ethylsuccinate 50 mg/kg/day orally divided into four doses for 14 days 8

Red Flags Requiring Ophthalmology Referral

Immediate referral is indicated for: 1

• Conjunctivitis in a neonate
• Severe eye pain or decreased vision
• Recent ocular surgery
• Vesicular rash on eyelids or nose (suggests herpes)
• History of rheumatologic disease
• Immunocompromised state

Common Pitfalls to Avoid

• Do not use topical antibiotics for viral conjunctivitis—they provide no benefit and contribute to antibiotic resistance 1
• Do not use topical corticosteroids without confirming the diagnosis—steroids can worsen herpes simplex viral conjunctivitis and bacterial infections 9
• Failing to recognize gonococcal or chlamydial conjunctivitis, which require systemic (not just topical) antibiotic therapy 8
• Overlooking the need for partner treatment and STI screening in sexually transmitted conjunctivitis 8