Marbofloxacin (Zeniquin) for Dogs – Once-Daily Fluoroquinolone
Marbofloxacin (Zeniquin) is a veterinary fluoroquinolone effective against gram-negative bacteria + Staphylococcus.
Dose
2.75-5.5 mg/kg PO once daily
Dose Reference Table
| Weight | Range |
|---|---|
| 5 kg | 14-28 mg |
| 10 kg | 28-55 mg |
| 15 kg | 41-83 mg |
| 20 kg | 55-110 mg |
| 30 kg | 83-165 mg |
| 40 kg | 110-220 mg |
Tablet sizes: 25, 50, 100, 200 mg (Zeniquin – splittable).
Duration
| Infection | Duration |
|---|---|
| UTI uncomplicated | 7-14 days |
| Pyelonephritis | 4-6 weeks |
| Skin / soft tissue | 14-28 days |
| Respiratory | 14-21 days |
| Deep otitis | 4-6 weeks |
| Prostatic infection | 4-6 weeks |
Marbofloxacin vs Enrofloxacin (Baytril)
| Feature | Marbofloxacin | Enrofloxacin |
|---|---|---|
| Dosing | Once daily | Twice daily |
| Spectrum | Similar | Similar |
| Compliance | Better | Lower |
| Retinal toxicity (cats) | Less concern | Risk |
| Cost | Similar | Similar |
âš Contraindications
- Young growing dogs (under 12 months large breed; under 8 months small breed) – cartilage toxicity
- Seizure disorder (lowers threshold)
- Pregnancy (caution)
- Hypersensitivity
Drug Interactions
- Calcium, iron, aluminum, magnesium – chelate FQ; separate by 2 hours
- Theophylline – increased levels
- Cyclosporine – increased levels
- Sucralfate – reduces absorption
- Antacids – reduce absorption
Side Effects
- GI upset (vomiting, anorexia, diarrhea) – most common
- CNS rare (seizures lowered threshold)
- Cartilage damage (growing dogs)
- Rare phototoxicity
- Rare crystalluria
âš Culture + Sensitivity Essential
For resistant infections – reserve fluoroquinolones for confirmed susceptibility to avoid resistance development.
Frequently Asked Questions
How much marbofloxacin should I give my dog?
STANDARD DOSE: 2.75-5.5 mg/kg PO ONCE daily. Higher dose for severe/resistant infections. EXAMPLES: 1) 5 kg = 14-28 mg; 2) 10 kg = 28-55 mg; 3) 15 kg = 41-83 mg; 4) 20 kg = 55-110 mg; 5) 30 kg = 83-165 mg; 6) 40 kg = 110-220 mg. TABLETS Zeniquin: 25, 50, 100, 200 mg (splittable). With or without food. SEPARATE from calcium/iron/dairy products by 2 hours (chelation reduces absorption). DURATION: UTI 7-14 days, pyelonephritis 4-6 weeks, skin 14-28 days, deep otitis 4-6 weeks. AVOID in growing dogs (cartilage toxicity). Culture + sensitivity essential for resistant infections. WORK WITH VETERINARIAN for appropriate antibiotic selection.
Marbofloxacin vs Baytril (enrofloxacin) – which is better?
BOTH effective fluoroquinolones. MARBOFLOXACIN advantages: 1) ONCE-DAILY dosing (vs Baytril twice-daily) – better compliance; 2) Similar spectrum; 3) Less retinal toxicity concern in cats (mainly cat issue); 4) Convenient. BAYTRIL advantages: 1) Available in injectable form widely; 2) Generic available; 3) Established use; 4) Familiarity. SPECTRUM similar – both cover: E. coli, Pseudomonas, Klebsiella, Staphylococcus, some atypicals. EFFICACY similar for most infections. CHOOSE MARBOFLOXACIN if: once-daily preferred, owner compliance concern, comparing cost (similar typically). CHOOSE BAYTRIL if: injectable needed, prior efficacy with it. BOTH should be reserved for confirmed susceptibility (culture + sensitivity) to avoid resistance development. NEITHER in growing dogs (cartilage). Both have GI side effects. Discuss with vet for individual case.
Why can’t I give marbofloxacin to my puppy?
CARTILAGE TOXICITY – fluoroquinolones can cause cartilage damage in GROWING dogs. AGE LIMITS: 1) Small breeds (under 20 kg adult weight) – avoid under 8 months; 2) Medium breeds – avoid under 12 months; 3) Large breeds (over 30 kg adult) – avoid under 12-18 months; 4) GIANT breeds – avoid until growth plates closed (18-24+ months). MECHANISM: fluoroquinolones interfere with cartilage development at growth plates. Documented in puppies + studies. JOINT damage can be PERMANENT. SAFER ANTIBIOTIC ALTERNATIVES for puppies: 1) AMOXICILLIN-CLAVULANATE (Clavamox) – safe puppies; 2) CEPHALEXIN – safe puppies; 3) DOXYCYCLINE – over 6 months (teeth staining concern earlier); 4) TRIMETHOPRIM-SULFA – generally safe; 5) AZITHROMYCIN – safe; 6) CHLORAMPHENICOL – for resistant cases. CHOOSE based on culture + sensitivity + age. AFTER GROWTH PLATES CLOSED (typically 12-18 months) fluoroquinolones safe. Veterinary guidance essential.
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References & Further Reading
The dosing ranges and safety information on this page are drawn from the following veterinary references. Always defer to your own veterinarian and the manufacturer’s label for your specific product.
- Plumb DC. Marbofloxacin.
- Zeniquin product information – Zoetis.
- Boothe DM. Small Animal Clinical Pharmacology and Therapeutics.
- Hillier A et al. Canine pyoderma treatment.
- ISCAID UTI Guidelines.
- PuppaDogs. Enrofloxacin Calculator, UTI Calculator. puppadogs.com.
