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Antibiotic eye drops are medicines used to treat eye infections caused by bacteria. They work by killing bacteria or stopping bacterial growth on the eye surface. They do not treat viral pink eye, allergic eye irritation, or redness from dryness. These drops should be used only when a clinician thinks a bacterial infection is present.
read more about antibiotic eye drops ...Antibiotic eye drops deliver medicine directly to the infected eye surface. Depending on the drug, they can kill bacteria or slow bacterial growth so the immune system can clear the infection. Common ophthalmic antibiotics include trimethoprim-polymyxin B, erythromycin, ciprofloxacin, ofloxacin, moxifloxacin, and tobramycin. The selected medicine depends on the suspected infection, patient age, allergy history, and corneal findings.
These drops are used for bacterial conjunctivitis, some corneal ulcers, bacterial keratitis, and selected eyelid or surface infections. Signs that can suggest bacterial infection include pus-like discharge, eyelids stuck together, and redness that starts in one eye. Similar symptoms can also come from viral or allergic conjunctivitis, so diagnosis matters. Contact lens wearers with redness or pain need prompt eye care because corneal infection risk is higher.
Use the drops exactly as prescribed and finish the full course unless the clinician tells you to stop. Wash your hands before use and avoid touching the bottle tip to the eye, eyelids, lashes, or skin. Do not share eye drops because that can spread infection. Contact lenses and eye makeup should be avoided until the clinician says it is safe to restart them.
Antibiotic eye drops can cause temporary stinging, irritation, blurred vision, or allergic reactions. Call an eye doctor right away for eye pain, light sensitivity, reduced vision, worsening redness, a white spot on the cornea, or symptoms after contact lens wear. Antibiotics can also be overused when pink eye is viral, which does not help and can add side effects. A proper exam helps match the treatment to the cause.
No, antibiotic eye drops do not treat viral pink eye. Viral conjunctivitis needs time and supportive care unless a clinician identifies a different cause.
Yes, antibiotic eye drops are generally prescription medicines in the United States. A clinician should confirm that bacteria are likely before treatment starts.
Some bacterial infections begin to improve within a few days, but timing depends on the infection and the medicine used. Finish the prescribed course unless the clinician tells you to stop.
No, leftover eye drops should not be used without medical guidance. Old drops can be contaminated, expired, or wrong for the cause of the current symptoms.
How To Treat Pink Eye. Centers for Disease Control and Prevention. https://www.cdc.gov/conjunctivitis/treatment/index.html. Date Accessed June 3, 2026.
Conjunctivitis or Pink Eye. MedlinePlus Medical Encyclopedia. https://medlineplus.gov/ency/article/001010.htm. Date Accessed June 3, 2026.
Pink Eye Diagnosis and Treatment. Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/pink-eye/diagnosis-treatment/drc-20376360. Date Accessed June 3, 2026.
Conjunctivitis: A Systematic Review of Diagnosis and Treatment. PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC4049531/. Date Accessed June 3, 2026.
Bacterial Conjunctivitis. EyeWiki. https://eyewiki.org/Bacterial_Conjunctivitis. Date Accessed June 3, 2026.