Marbofloxacin (Zeniquin) for Cats: Uses & Dosage

This information is for educational purposes only. Never give your pet any medication without your veterinarian's guidance. Dosing, frequency, and safety depend on your pet's specific health profile.

Marbofloxacin, sold under the brand name Zeniquin, is a prescription fluoroquinolone antibiotic used in cats and dogs. It works by interfering with bacterial DNA replication, which helps stop susceptible bacteria from multiplying. In cats, your vet may use it for selected infections when the likely bacteria and your cat's overall health make it a reasonable option.

This medication is usually given by mouth once daily as a tablet, and some cats may receive a compounded liquid if tablet dosing is difficult. Marbofloxacin is often chosen when your vet wants a once-daily antibiotic with good tissue penetration, but it is not the right fit for every infection. Antibiotic choice should be guided by the infection site, prior antibiotic exposure, and, when possible, culture and susceptibility testing.

Cats are more sensitive than dogs to certain fluoroquinolone eye toxicities, so dosing accuracy matters. Marbofloxacin appears safer for the feline retina than enrofloxacin at standard doses, but high doses and some underlying conditions can still raise concern. That is one reason your vet may be careful about dose calculations, kidney status, and follow-up.

Marbofloxacin is used to treat bacterial infections, not viral infections. In cats, your vet may prescribe it for urinary tract infections, kidney infections, some skin and soft tissue infections, bite wound infections, and selected respiratory infections when the suspected bacteria are likely to respond.

It may also be used off-label in certain feline cases, which means the use is medically accepted in practice but not specifically listed on the label for that exact situation. Off-label use is common in veterinary medicine. Your vet may consider marbofloxacin when a cat needs once-daily dosing, when other antibiotics have not worked well, or when culture results show the bacteria are susceptible.

Because fluoroquinolones are important antibiotics, many vets try to use them thoughtfully rather than as a first choice for every mild infection. If your cat has a recurrent infection, a deep wound, kidney involvement, or a history of antibiotic resistance, your vet may recommend urine culture, wound culture, or other testing before or during treatment.

Typical oral dosing references for cats list marbofloxacin at about 2.75 to 5.5 mg/kg by mouth every 24 hours, but the exact dose and treatment length depend on the infection being treated and your cat's medical history. Your vet may choose a dose near the lower or higher end of that range based on the bacteria involved, the body system affected, and how severe the infection is.

Marbofloxacin is often given on an empty stomach for best absorption. If your cat vomits or seems nauseated when dosed without food, your vet may suggest giving it with a small meal instead. Do not change the dose, split tablets differently, or stop early unless your vet tells you to. Stopping too soon can allow the infection to return and may contribute to antibiotic resistance.

Tell your vet about kidney disease, neurologic disease, pregnancy, nursing status, or if your cat is still growing. Fluoroquinolones are generally avoided in growing animals because of cartilage concerns. If you miss a dose, give it when you remember unless it is close to the next scheduled dose. In that case, skip the missed dose and return to the regular schedule. Do not double up.

The most common side effects are digestive upset, including vomiting, diarrhea, and reduced appetite. Some cats also seem tired or less interested in food for a short time. Mild stomach upset may improve if your vet advises giving the medication with a small amount of food.

More serious reactions are less common but need prompt veterinary attention. Contact your vet right away if your cat develops wobbliness, tremors, seizures, marked lethargy, behavior changes, rash, facial swelling, trouble breathing, or ongoing refusal to eat. Rare liver irritation has also been reported.

Cats on high doses of fluoroquinolones can be at risk for retinal injury and vision loss. Marbofloxacin is considered less retinotoxic than enrofloxacin at standard feline doses, but sudden vision changes, dilated pupils, bumping into objects, or apparent blindness should be treated as urgent. See your vet immediately if those signs appear.

Marbofloxacin can interact with products that contain calcium, iron, aluminum, magnesium, or similar minerals because they can reduce absorption from the gut. That includes some antacids, sucralfate-type stomach medications, supplements, and dairy-containing treats or foods. If your cat needs both, your vet may space them apart.

Use extra caution if your cat has a seizure disorder or takes medications that may lower the seizure threshold. Your vet will also want to know about any nonsteroidal anti-inflammatory drugs, supplements, compounded medications, or other antibiotics your cat receives, because the full medication picture can affect safety and monitoring.

Before starting marbofloxacin, give your vet a complete list of everything your cat takes, including over-the-counter products and herbal items. That helps your vet choose the safest schedule and decide whether another antibiotic would be a better fit.