Ofloxacin eye drops are a prescription antibiotic used to treat bacterial infections of the eye, specifically bacterial conjunctivitis (pink eye) and corneal ulcers. The drops come as a 0.3% solution and work by killing the bacteria causing the infection, typically over a course of one to two weeks depending on the condition being treated.
Bacterial Conjunctivitis (Pink Eye)
The most common reason you’ll be prescribed ofloxacin eye drops is bacterial conjunctivitis. This is an infection of the thin membrane covering the white of your eye and the inner surface of your eyelids. Symptoms include redness, discharge (often yellow or green), crustiness around the lashes in the morning, and a gritty feeling in the eye.
For conjunctivitis, the typical treatment schedule lasts about a week. During the first two days, you apply one to two drops in the affected eye every two to four hours while awake. From day three through day seven, the frequency drops to four times daily. Most people notice improvement within the first couple of days, but finishing the full course matters to clear the infection completely and reduce the chance of antibiotic resistance.
Ofloxacin is approved for this use in adults and children one year of age and older. Safety in infants under one year has not been established.
Corneal Ulcers
The second approved use is treating bacterial corneal ulcers, which are open sores on the cornea, the clear front surface of your eye. These are more serious than conjunctivitis and can threaten your vision if not treated promptly. Contact lens wearers, people who’ve had an eye injury, and those with very dry eyes are at higher risk.
Treatment for corneal ulcers is more aggressive than for pink eye. The dosing schedule starts with drops applied much more frequently, including through the night in many cases, then gradually tapers over a period of about 10 to 14 days. Your eye doctor will monitor healing closely and may adjust the schedule based on how the ulcer responds.
How Ofloxacin Kills Bacteria
Ofloxacin belongs to a class of antibiotics called fluoroquinolones. It works by blocking an enzyme that bacteria need to copy and repair their DNA. Without this enzyme functioning, the bacteria can’t reproduce or survive, and the infection clears.
The drops are effective against a broad range of bacteria. On the gram-positive side, that includes Staphylococcus aureus, Staphylococcus epidermidis, and Streptococcus pneumoniae, which are among the most common causes of bacterial eye infections. On the gram-negative side, it covers Haemophilus influenzae, Pseudomonas aeruginosa, Proteus mirabilis, and Enterobacter cloacae. This wide coverage is part of why ofloxacin is a go-to choice: it handles the bacteria most likely to be responsible before culture results come back.
What Ofloxacin Does Not Treat
Ofloxacin only works against bacterial infections. It will not help with viral conjunctivitis (the most common type of pink eye, often caused by adenovirus), allergic conjunctivitis triggered by pollen or pet dander, or fungal eye infections. If your symptoms don’t improve after a few days of treatment, the cause may not be bacterial.
Side Effects
The most commonly reported side effect is a brief stinging or burning sensation right after you put the drops in. This typically fades within a minute or two. Some people also notice temporary blurred vision, mild eye redness, or a sensation of something in the eye. These are generally mild and don’t require stopping treatment.
Less common reactions include eye itching, tearing, dryness, or sensitivity to light. Serious allergic reactions are rare but possible with any fluoroquinolone. If you develop swelling around the eyes, a rash, or difficulty breathing after using the drops, seek medical attention.
Tips for Using the Drops
If you wear contact lenses, remove them before applying ofloxacin. The drops contain a preservative called benzalkonium chloride that can discolor soft lenses. Wait at least 15 minutes after using the drops before putting your lenses back in. In many cases, your doctor will recommend avoiding contact lenses entirely until the infection has cleared.
When applying the drops, tilt your head back and pull down your lower eyelid to create a small pocket. Let the drop fall into that pocket without touching the dropper tip to your eye or any other surface. This prevents contaminating the bottle. If you’re using other eye medications, space them at least five minutes apart so each one has time to absorb.
Keep the bottle at room temperature and discard it once you’ve completed your treatment course. Even if your symptoms resolve early, use the drops for the full prescribed duration. Stopping early can allow surviving bacteria to regrow and potentially become resistant to the antibiotic.