Besifloxacin eye drops: what they are and when to use them

Besifloxacin is an antibiotic eye drop used to treat bacterial conjunctivitis (pink eye). It belongs to the fluoroquinolone family and fights bacteria that cause eye infections. Doctors prescribe it when a bacterial cause is likely or confirmed. If your eye redness, discharge, or discomfort started suddenly and is getting worse, a short course of besifloxacin can clear the infection fast.

How besifloxacin is used

Typical dosing for adults and children 1 year and older is one drop in the affected eye three times a day for seven days. Your doctor may change the dose depending on the case. Put the drop in the lower eyelid pocket, blink a few times, and avoid touching the dropper tip to your eye or fingers. If you wear contact lenses, remove them before treatment and don’t put them back in until your doctor says it’s safe. Using the drops for too short a time can let the infection return; using them unnecessarily can promote resistant bacteria.

Side effects, precautions, and practical tips

Most people tolerate besifloxacin well. The common side effects are mild and local: temporary burning or stinging, eye redness, blurred vision right after the drop, and a bad taste in the mouth for a short time. Severe reactions like swelling, intense pain, or sudden vision changes are rare but need immediate medical attention.

Avoid besifloxacin if you know you’re allergic to fluoroquinolones. Systemic absorption from eye drops is very low, so major drug interactions are uncommon, but tell your doctor about other medications and health conditions. Don’t use antibiotic drops for viral or allergic conjunctivitis — they won’t help and can cause side effects or resistance.

Simple tips to get the most from treatment: wash your hands before and after each use; wipe away crust or discharge with a clean tissue; tilt your head back and pull the lower lid down to form a pocket before instilling a drop; if you miss a dose, give it when you remember unless it’s almost time for the next one; never double up doses.

If symptoms don’t improve after 48–72 hours, get rechecked. Worsening pain, light sensitivity, or changes in vision require urgent care. For recurrent infections or frequent antibiotic use, your doctor may order a culture to identify the exact bacteria and the best treatment.

Besifloxacin is a useful, short-course option for bacterial eye infections when used correctly. Talk with your healthcare provider to confirm the diagnosis and the right plan for you. For product availability and guidance, consult your pharmacist or clinic.