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PetDosageChart

Baytril (Enrofloxacin) Dosage for Cats

Fluoroquinolone antibiotic ⏱ Onset: 1-2 hours ⏳ Duration: 24 hours

This dosage information is for educational purposes only. Always consult your veterinarian before giving any medication to your pet. Dosages may vary based on your pet's health conditions, other medications, and individual factors.

Content reviewed by licensed veterinarians. This information is sourced from veterinary drug references including Plumb's Veterinary Drug Handbook and the Merck Veterinary Manual.

Dosage Calculator

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Baytril Dosage Chart for Cats by Weight

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Weight Low Dose Standard Dose Max Dose Frequency
3 lbs (1.4 kg) 7mg 7mg 7mg once daily
4 lbs (1.8 kg) 9mg 9mg 9mg once daily
5 lbs (2.3 kg) 11.5mg 11.5mg 11.5mg once daily
6 lbs (2.7 kg) 13.5mg 13.5mg 13.5mg once daily
7 lbs (3.2 kg) 16mg 16mg 16mg once daily
8 lbs (3.6 kg) 18mg (22.7mg tablet) 18mg (22.7mg tablet) 18mg (22.7mg tablet) once daily
9 lbs (4.1 kg) 20.5mg (22.7mg tablet) 20.5mg (22.7mg tablet) 20.5mg (22.7mg tablet) once daily
10 lbs (4.5 kg) 22.5mg (22.7mg tablet) 22.5mg (22.7mg tablet) 22.5mg (22.7mg tablet) once daily
12 lbs (5.4 kg) 27mg (22.7mg tablet) 27mg (22.7mg tablet) 27mg (22.7mg tablet) once daily
14 lbs (6.3 kg) 31.5mg 31.5mg 31.5mg once daily
16 lbs (7.3 kg) 36.5mg 36.5mg 36.5mg once daily
18 lbs (8.2 kg) 41mg (2 × 22.7mg) 41mg (2 × 22.7mg) 41mg (2 × 22.7mg) once daily
20 lbs (9.1 kg) 45.5mg (2 × 22.7mg) 45.5mg (2 × 22.7mg) 45.5mg (2 × 22.7mg) once daily
25 lbs (11.3 kg) 56.5mg 56.5mg 56.5mg once daily

What is Baytril (Enrofloxacin) used for in cats?

bacterial infections urinary tract infections skin infections respiratory infections mycoplasma infections

How to give Baytril to your cat

CRITICAL: Never exceed 5 mg/kg per day in cats — higher doses have been definitively linked to irreversible retinal degeneration causing permanent blindness. Give the tablet with food to reduce GI upset and mask the bitter taste. Baytril tablets are very bitter, so avoid crushing them. A pill gun or pill pocket can help. Separate administration from antacids or sucralfate by at least 2 hours, as these reduce absorption.

Available Forms

tablet, injectable, liquid

Give with Food?

Yes — give with food

Side effects of Baytril in cats

Common side effects

GI upset (vomiting, diarrhea)
decreased appetite
mild lethargy
drooling from bitter taste

Serious side effects

  • irreversible retinal degeneration and blindness
  • seizures
  • cartilage damage in young cats
  • severe allergic reaction

When to call the vet

Call your vet immediately if your cat shows any of these signs:

  • Any vision changes — dilated pupils, bumping into things, reluctance to jump (retinal damage)
  • Seizures or tremors
  • Severe vomiting or bloody diarrhea
  • Swelling of the face or difficulty breathing (allergic reaction)
  • Lameness or joint swelling in young cats

Related Medications for Cats

Antibiotic (Penicillin)

Amoxil

Amoxicillin

For bacterial infections

View dosage chart
First-Generation Cephalosporin Antibiotic

Keflex

Cephalexin

For Skin and soft tissue infections

View dosage chart
Antibiotic (Tetracycline)

Vibramycin

Doxycycline

For upper respiratory infections

View dosage chart
Nitroimidazole Antibiotic / Antiprotozoal

Flagyl

Metronidazole

For Inflammatory bowel disease (IBD)

View dosage chart

Sources & References

The dosage information on this page is compiled from the following veterinary and pharmaceutical references:

  • Plumb's Veterinary Drug Handbook — the standard veterinary pharmacology reference used by veterinarians worldwide.
  • Merck Veterinary Manual — a trusted, peer-reviewed resource for veterinary professionals and pet owners.
  • DailyMed (FDA Drug Labels) — official FDA-approved drug labeling and prescribing information for Enrofloxacin.

Frequently Asked Questions

Can Baytril cause blindness in cats?
Yes, this is the most critical safety concern with enrofloxacin in cats. Doses exceeding 5 mg/kg per day have been associated with irreversible retinal degeneration leading to permanent blindness. This effect is unique to cats and is dose-dependent. At the recommended 5 mg/kg dose, the risk is very low, but cats should be monitored for any vision changes during treatment.
Why is Baytril dose-limited in cats but not dogs?
Cats have a unique susceptibility to enrofloxacin-induced retinal toxicity that is not seen in dogs. The exact mechanism involves accumulation of the drug in the retinal tissue of cats. Dogs can safely receive higher doses (5-20 mg/kg), but cats must never exceed 5 mg/kg per day. This is one of the most important species-specific drug safety differences in veterinary medicine.
How long should a cat take Baytril?
Typical treatment courses are 7-14 days, depending on the type and severity of infection. Some chronic infections may require longer courses. Always complete the full prescribed course even if your cat appears better, as stopping early can lead to antibiotic resistance.
Can I give Baytril to a kitten?
Enrofloxacin is not recommended for kittens under 1 year of age because fluoroquinolones can damage developing cartilage and joints in growing animals. Your vet will choose a safer alternative antibiotic for young cats.
What should I do if my cat vomits after taking Baytril?
Baytril is very bitter and commonly causes GI upset in cats. Give it with food to reduce nausea. If vomiting persists, contact your vet — they may switch to the injectable form or prescribe an alternative antibiotic. Do not give a second dose if your cat vomits immediately after, as overdosing is dangerous in cats.

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