Pet Drug Reports

Marbofloxacin (Zeniquin, Marboquin)adverse event reports that FDA received

Active ingredient

Also sold as: Zeniquin, Marboquin, Cronoquin.

The openFDA records give the value "MSK" for the brand name and for the manufacturer name of each drug. FDA says that MSK means "masked". So the site cannot count a report for a brand.

Read this first. FDA says this about the data:

An API dataset query result cannot be used to estimate the risk associated with the product or compare one drug or device product with another. When looking at the results, be aware that there is no certainty that the reported drug or device caused the adverse event. This dataset should not be the sole source of information for clinical decision-making or other assumptions about the safety or effectiveness of a product. The adverse event may have been related to an underlying disease, other drugs used at the same time or other non-drug related sources.

FDA Center for Veterinary Medicine publishes these words. Source: Adverse Event Reports for Animal Drugs and Devices, read on . The data have the reports that FDA received through .

This page is not veterinary advice. For an animal that is ill, speak to a veterinarian.

Contacting a veterinarianHow to report to FDA

From September 1999 to June 2026, FDA received 1,848 adverse event reports that name a drug with marbofloxacin as its active ingredient. Of the 1,848 reports, 1,226 (66.3%) are about dogs. 566 reports are about cats (30.6%).

In January to March 2026, FDA received 17 reports that name this drug. The signs that appear in the largest number of the 1,848 reports are "Vomiting", "Anorexia" and "Lack of efficacy (bacteria) - NOS". A report is not proof that a drug caused a sign.

Reports that name this drug fell by 14.9% in the 12 months to June 2026, compared with the 12 months before. Reports for all animal drugs fell by 4.6% in the same periods. The newest months can get more reports in a later update. Reports about cats are 30.6% of the reports that name this drug, and 11% of all reports.

Since the last update of the FDA data

The latest update of the FDA data, recorded on , changed no count of this page.

January to March 2026 is the latest closed quarter in the data. In that quarter FDA received 17 reports that name marbofloxacin: 11 dog, 6 cat, 0 horse, 0 other or not given.

All updatesFeed of updates (RSS)

Signs that the reports list

A sign is a coded term from the report. The words in brackets are a plain gloss of the term. The percentage is the share of the 1,848 reports that list the sign. One report can list more than one sign.

The sign that is in the largest number of the reports comes first.

  1. Vomiting15.9%293 reports
  2. Anorexia[not eating]13.6%251 reports
  3. Lack of efficacy (bacteria) - NOS[the product did not have the expected effect: target not specified]11.4%211 reports
  4. Lethargy[unusually tired or inactive]9.5%176 reports
  5. Death by euthanasia[the animal was euthanized]7.9%146 reports
  6. Depression[dull, quiet or withdrawn]7.8%144 reports
  7. Ataxia[unsteady, uncoordinated movement]6.5%120 reports
  8. Death6.4%118 reports
  9. Diarrhoea[diarrhea]5.7%105 reports
  10. Other abnormal test result NOS[abnormal laboratory result, type not specified]5.6%103 reports
  11. Weight loss5.5%102 reports
  12. Anaemia NOS[low red blood cell count]5.3%98 reports
  13. Lack of efficacy - NOS[the product did not have the expected effect]4.8%88 reports
  14. Elevated blood urea nitrogen (BUN)[a kidney value above the normal range]4.7%86 reports
Show the next 16 signs
  1. Elevated alanine aminotransferase (ALT)[a liver enzyme above the normal range]4.5%84 reports
  2. Leucocytosis NOS[high white blood cell count]4.5%84 reports
  3. Elevated serum alkaline phosphatase (SAP)[a liver and bone enzyme above the normal range]4%74 reports
  4. Elevated creatinine[a kidney value above the normal range]4%73 reports
  5. Behavioural disorder NOS[behaviour change, type not specified]3.9%72 reports
  6. Blindness3.8%71 reports
  7. Convulsion[seizure]3.8%71 reports
  8. Fever3.7%68 reports
  9. Lameness3.6%67 reports
  10. Decreased appetite3.4%63 reports
  11. Polydipsia[drinking more than usual]2.9%54 reports
  12. Seizure NOS[seizure, type not specified]2.9%54 reports
  13. Abnormal radiograph finding2.6%48 reports
  14. Not eating2.5%47 reports
  15. Urinary tract infection2.5%47 reports
  16. Elevated total bilirubin[bilirubin above the normal range]2.4%45 reports

The list shows 30 of 1,077 coded signs. A report is not proof that a drug caused a sign. Download all signs (CSV)

Reports by species

  • Dog66.3%1,226
  • Cat30.6%566
  • Human exposure0.3%6
  • Other0.2%3
  • Parrot0.1%1
  • Rabbit0.1%1

The share is of all 1,848 reports that name marbofloxacin. The other reports give a different species or no species.

Reports for each month, Jul 2021 to Jun 2026

Dog167 reports. Largest count in one month: 8 (Apr 2024)
Cat83 reports. Largest count in one month: 6 (Nov 2024)
Horse0 reports

No chart: no month has 5 or more reports.

Other or not given4 reports

No chart: no month has 5 or more reports.

The month is the month in which FDA received the report. Each chart has its own scale. FDA says that a report can take 3 to 6 months to reach the public data. The newest months can get more reports in a later update.

Reports by year

  • Dog
  • Cat
  • Horse
  • Other or not given
Reports that name marbofloxacin, by the year in which FDA received them and by species
YearDogCatHorseOther or not givenAll species
202616120129
202556150273
202439310070
202321150137
20221890027
20212640232
202036170053
201932100143
201842170261
201756140272
201662230388
201553170272
2014732902104
201357230181
201261240186
201146300177
201033270060
200947270175
200856320391
2007763302111
200651240378
200531210153
200439320576
200332310669
2002623706105
20014370151
20005650566
199960028

2026 has the reports that FDA received through Jun 2026. Download the years (CSV)

What the reports record

Outcome at the time of the report

  • Recovered/Normal8.2%152
  • Recovered with Sequela[recovered, with a lasting effect]0.5%9
  • Ongoing22.1%409
  • Died9.5%176
  • Euthanized4.3%79
  • Outcome Unknown11.2%207

An outcome in a report is not proof that the drug caused it. The person who sends the report gives the outcome. Each share is of the 1,848 reports that name marbofloxacin.

A report about more than one animal can have more than one outcome.

Kind of report

  • Safety issue89.4%1,653
  • Lack of expected effectiveness2.8%51
  • Both safety and lack of expected effectiveness5.1%95
  • Manufacturing or product defect2.6%48
  • Other0.1%1

908 reports say if the event was serious. 42.4% of them have the serious flag. The person who sends the report sets the flag.

Show age, weight, breed and route

Age of the animal

  • Under 1 year7.3%134
  • 1 to 3 years11.1%205
  • 4 to 7 years21.1%390
  • 8 to 11 years26.1%482
  • 12 years and over26.4%488
  • Age not given8.1%149

Weight of the animal

  • Under 5 kg (11 lb)23.9%441
  • 5 to 9.9 kg (11 to 22 lb)25.5%472
  • 10 to 24.9 kg (22 to 55 lb)20.6%381
  • 25 to 44.9 kg (55 to 99 lb)17%315
  • 45 kg and over (99 lb and over)2.9%54
  • Weight not given10%185

Breed, where the report gives one breed

A breed with many animals has many reports.

Route in the report

  • Oral92%1,701
  • Subcutaneous0.1%2
  • Topical0.1%2

Each bar is on a scale of 0 to 100%.

Approved animal drugs with this active ingredient (FDA Green Book)

This section is reference data. It has no report count.

The openFDA records give the value "MSK" for the brand name and for the manufacturer name of each drug. FDA says that MSK means "masked". So the site cannot count a report for a brand.

Brand names

  • Zeniquin
  • Marboquin
  • Cronoquin

What the Green Book records give

Applications with an approval in force
5
Approved species
Cats, Dogs
Dose forms
Tablet, Chewable Tablets
Routes
Oral
Sale
RX (prescription)
Earliest approval date in the records

The species, dose forms and routes are the words of the Green Book records for all the applications together. One product can have fewer. The label of a product gives its approved use.

Applications in the Green Book of 2 Nov 2026, pioneer applications (NADA) first
Brand nameActive ingredientsSponsorApproved speciesApplication
ZeniquinMarbofloxacinZoetis Inc.Dogs, CatsNADA 141-151
MarboquinMarbofloxacinDechra Veterinary Products LLCDogs, CatsANADA 200-586
Marbofloxacin Chewable TabletsMarbofloxacinFelix Pharmaceuticals Pvt. Ltd.Dogs, CatsANADA 200-733
MarbofloxacinMarbofloxacinZyVet Animal Health, Inc.Dogs, CatsANADA 200-736
Cronoquin TabletsMarbofloxacinCronus Pharma Specialities India Private Ltd.Not in the list of major speciesANADA 200-761

Next in the A to Z list

All drugs by active ingredient. Brand names A to Z

FDA pages for this drug

The site checked these addresses on . The links open in a new tab.

Cite this page

Pet Drug Reports. Marbofloxacin: adverse event reports that FDA received. https://petdrugreports.com/drug/marbofloxacin/ Source: FDA Center for Veterinary Medicine, openFDA Animal and Veterinary adverse event reports, export of . Reports received through .

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Where the data come from

The counts come from the openFDA Animal and Veterinary adverse event files, export of 30 Oct 2026. The files have the reports that the FDA Center for Veterinary Medicine received through 26 Jun 2026. The files mask brand and manufacturer names. The site counts a drug by the active ingredients that each record gives, and gives no count to a brand, an application or a company. Ingredient names and the lists of approved products follow the FDA Green Book of 2 Nov 2026. The site does not use the application number that a record has.

The site does not publish report text, lot numbers or details of a reporter. FDA's record is the authority. See how the site counts reports, the data sources and the corrections page.

Questions about these reports

Which brand are these reports about?

The openFDA records give the value "MSK" for the brand name and for the manufacturer name of each drug. FDA says that MSK means "masked". So the site cannot count a report for a brand. The Green Book section of this page lists the brand names with this active ingredient.

Do the reports show that the drug caused the signs?

No. FDA states this about the data.

When looking at the results, be aware that there is no certainty that the reported drug or device caused the adverse event.

The adverse event may have been related to an underlying disease, other drugs used at the same time or other non-drug related sources.

FDA Center for Veterinary Medicine. Source: Adverse Event Reports for Animal Drugs and Devices

How many reports did FDA receive in the latest 12 months?

FDA received 63 reports in the 12 months to June 2026. It received 74 reports in the 12 months before. FDA says that a report can take 3 to 6 months to reach the public data. The newest months can get more reports in a later update.

What kinds of report are in the count?

Of the 1,848 reports received from September 1999 to June 2026, 89.4% are about a safety issue only. 7.9% are about a lack of expected effectiveness, alone or with a safety issue. 2.6% are about a defect of the product or its package.