Ciprofloxacin: uses, dosing, side effects & brands

CILOXAN ® (ciprofloxacin ophthalmic ointment) 0.3% is a synthetic, sterile, multiple dose, antimicrobial for topical use. Ciprofloxacin is a fluoroquinolone antibacterial. It is available as the monohydrochloride monohydrate salt of 1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylic acid.

The FDA classifies ciprofloxacin as a fluoroquinolone antibacterial. If you are checking whether it is safe to combine with something else, the class is what matters — two drugs from the same class usually should not be stacked.

The label classifies ciprofloxacin as Pregnancy Category C. Animal reproduction studies in rats and mice (at doses up to six times the usual daily human oral dose) revealed no evidence of impaired fertility or harm to the fetus, and no teratogenicity was seen in rabbits; at high oral doses rabbits had gastrointestinal disturbances with maternal weight loss and increased abortion. There are no adequate and well-controlled studies in pregnant women, so the label states it should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus. Discuss use in pregnancy with your prescriber. This is what ciprofloxacin's FDA label says; whether to use it in pregnancy is your prescriber's decision.

The elimination half-life of ciprofloxacin is about 4 hours — that is how long the body takes to clear half of a dose. This is the serum elimination half-life in adults with normal kidney function; it is slightly longer when kidney function is reduced and about 20% longer in older adults, and no metabolite has a materially longer half-life. Half-life is not the same as how long a drug test can detect the drug, and it varies with age, kidney and liver function.

It depends on the medicine. We check it against the FDA labels rather than guessing: our interaction checker searches each drug's own label for the other and quotes what it says, naming the section it came from. Run ciprofloxacin against whatever else you take — and remember that a label not naming a drug is not the same as that combination being safe.

We track 8 ciprofloxacin-containing products in the U.S.: Ciloxan, Ciprofloxacin in Dextrose 5% in Plastic Container, Cetraxal, Cipro in Dextrose 5% in Plastic Container, Cipro in Sodium Chloride 0.9% in Plastic Container, Ciprofloxacin Hydrochloride, Otiprio and Proquin XR. They are the same active ingredient; they differ in form, manufacturer, price and FDA recall record.

Across the brands we track, ciprofloxacin is currently marketed as topical, injectable, drops, solution and tablet, extended release, per the FDA's National Drug Code Directory. Each form is dosed differently — follow the label for the exact product you were prescribed.

Yes. Our catalog lists 2 generic ciprofloxacin products alongside the brand versions. A generic has the same active ingredient and must meet the FDA's bioequivalence standard; it usually costs less. Ask your pharmacist which one your plan covers.

The FDA's Enforcement database lists at least 5 recall records whose product description mentions ciprofloxacin. The most recent: Ciprofloxacin 0.3% and Dexamethasone 0.1% Otic Suspension Rx Only (Aug 13, 2025). A recall applies to specific lots, not to the drug as a whole — check the record for the affected lot numbers.

Food: milk and other dairy, calcium- or iron-fortified foods and supplements, and antacids — see the food section above for what each one does and whether it means avoiding it or just being consistent. Other medicines: we hold source-cited interaction answers for Can you drink alcohol while taking ciprofloxacin (Cipro)? and Can you take ciprofloxacin (Cipro) with milk or dairy?. This is what the FDA label and our cited sources say — it is not a complete list. Your pharmacist can check your own combination.

The most common are nausea, diarrhea, dizziness, and headache, with vomiting or a rash less often. These are usually mild. Even so, ciprofloxacin carries serious warnings out of proportion to how common they are, which is why it is now reserved for infections without safer alternatives.

Ciprofloxacin carries FDA boxed warnings for tendinitis and tendon rupture (most often the Achilles, with higher risk over 60, on steroids, or after a transplant), peripheral neuropathy (nerve damage in the arms or legs that can become permanent), central-nervous-system effects (seizures, confusion, hallucinations, anxiety), and worsening of myasthenia gravis, in which it should not be used. Because these can be serious and lasting, it is reserved for cases where other antibiotics can't be used.

Stop and call your doctor at the first sign of tendon pain, swelling, or a snap or pop (often at the back of the ankle); numbness, tingling, burning, or weakness in the hands or feet; or new anxiety, confusion, hallucinations, or a seizure. Also seek urgent care for sudden severe belly, chest, or back pain (a rare aortic warning), fainting or an irregular heartbeat (QT prolongation), or severe or bloody diarrhea (C. difficile). A severe rash, facial swelling, or trouble breathing is a medical emergency.

Yes. It can make you sensitive to sunlight, so use sun protection. It can raise or lower blood sugar, which matters if you have diabetes. Don't take it at the same time as dairy, calcium, antacids, or iron or zinc supplements, separate them by a couple of hours or the drug won't absorb properly. Stay hydrated, and avoid heavy exercise if you notice any joint or tendon soreness.