Enrofloxacin (Baytril) for Cats: Uses, Dosage & Safety

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.

Enrofloxacin, commonly sold as Baytril, is a prescription fluoroquinolone antibiotic used in veterinary medicine to treat certain bacterial infections in cats. It does not treat viral infections, and it is not the right choice for every infection. Your vet may choose it when the suspected bacteria are likely to respond, or when culture and susceptibility testing support its use.

In cats, enrofloxacin needs extra caution because this drug has a well-known retinal toxicity risk. At higher doses, some cats can develop sudden eye damage that may lead to vision loss or blindness. Because of that, the labeled feline dose should not exceed 5 mg/kg per day, and your vet may consider other antibiotics when they fit the infection better.

This medication is available in tablets and may sometimes be compounded if a cat cannot take the standard form. Compounded versions can help with dosing or administration, but your vet should decide whether that option is appropriate. If your cat has kidney disease, liver disease, seizure history, or any vision changes, tell your vet before treatment starts.

Enrofloxacin is used for susceptible bacterial infections, especially when gram-negative bacteria are a concern or when first-line antibiotics are not a good fit. In cats, your vet may consider it for some urinary tract infections, skin and soft tissue infections, wound infections, abscesses, and certain respiratory infections. It is sometimes used off-label in other situations when culture results support that choice.

That said, antibiotic selection should match the site of infection, the likely bacteria, and the cat's overall health. Feline antimicrobial guidelines emphasize that antibiotics should be used only for appropriate clinical indications and that culture and susceptibility testing can be very helpful, especially for recurrent, deep, or complicated infections.

Enrofloxacin is not a routine answer for every sneezing cat or every lower urinary tract sign. Many feline upper respiratory cases are viral, and many lower urinary tract problems are not bacterial infections at all. That is why your vet may recommend diagnostics first instead of starting an antibiotic automatically.

Cats should receive enrofloxacin only under your vet's direction. A commonly referenced feline dose is 5 mg/kg by mouth, injection, or under the skin every 24 hours, and the product labeling warns not to exceed 5 mg/kg/day in cats because of retinal toxicity risk. The exact dose, route, and treatment length depend on the infection being treated, culture results, kidney and liver function, and whether your cat is taking other medications.

Treatment duration varies. Some straightforward infections may need only a short course, while deeper or more complicated infections can require longer therapy and follow-up testing. Your vet may want a urine culture, wound culture, bloodwork, or recheck exam before deciding whether to continue, stop, or change the antibiotic.

Give the medication exactly as prescribed and finish the course unless your vet tells you to stop. If your cat vomits after a dose, refuses the tablet, or seems hard to medicate, call your vet before changing the schedule. Do not increase the dose to make up for a missed dose, and do not use leftover antibiotics from a previous illness.

The most common side effects are digestive upset, including vomiting, diarrhea, and reduced appetite. Some cats may also seem tired, restless, or less interested in food for a day or two after starting treatment. Mild stomach upset can happen with many antibiotics, but persistent vomiting, worsening lethargy, or refusal to eat should prompt a call to your vet.

The side effect that matters most in cats is eye toxicity. Rarely, cats on enrofloxacin can develop dilated pupils, trouble seeing, bumping into things, staring, or sudden blindness, especially at higher doses. See your vet immediately if you notice enlarged pupils or any sudden vision change.

Less common but important concerns include uncoordinated walking, seizures, depression, allergic reactions, elevated liver enzymes, and urinary crystals. Cats with kidney disease may be at higher risk for toxicity because the drug can reach higher levels in the body. If your cat seems neurologically abnormal, collapses, has facial swelling, or develops hives, contact your vet right away.

Enrofloxacin can interact with several medications and supplements, so your vet should review everything your cat takes, including over-the-counter products. The most practical interaction is with metal-containing products such as antacids, calcium, iron, magnesium, zinc, and sucralfate. These can reduce absorption from the intestinal tract and make the antibiotic work less reliably.

Other cautions include theophylline, because fluoroquinolones can reduce methylxanthine breakdown, and nitrofurantoin, which may reduce quinolone effectiveness for urinary infections. VCA also lists caution with corticosteroids, cyclosporine, levothyroxine, mycophenolate mofetil, certain other antibiotics, dairy products, and zinc-containing products.

Because some quinolones and other drugs are metabolized through the liver, concurrent therapy may change how either medication is cleared. That does not always mean the combination cannot be used. It means your vet may need to adjust timing, choose a different antibiotic, or monitor more closely.