Chlortetracycline Hydrochloride (ChlorMax, Micro CTC): adverse event reports that FDA received
Active ingredient
Also sold as: ChlorMax, Micro CTC, Fermycin, Chloronex, Cltc, Pennchlor 64, and 2 more brand names.
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 FDAFrom August 1987 to July 2025, FDA received 98 adverse event reports that name a drug with chlortetracycline hydrochloride as its active ingredient. Of the 98 reports, 11 (11.2%) are about cattle. 1 report is about people who were exposed to the drug (1%).
In January to March 2026, FDA received no reports that name this drug. The signs that appear in the largest number of the 98 reports are "Containers, Damaged", "Underfilling, Package" and "Seal, Abnormal". A report is not proof that a drug caused a sign.
Fewer than 20 reports named this drug in the 12 months before June 2026, so this page gives no change.
Search engines list a drug page with 500 reports or more in all years. The page also needs 30 reports or more in the 12 months to June 2026. This page is under one of these numbers. The site keeps the page and keeps it out of search engines.
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 0 reports that name chlortetracycline hydrochloride: 0 dog, 0 cat, 0 horse, 0 other or not given.
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 98 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.
- Containers, Damaged[a product quality report, not a sign in an animal]58.2%57 reports
- Underfilling, Package[a product quality report, not a sign in an animal]20.4%20 reports
- Seal, Abnormal[a product quality report, not a sign in an animal]19.4%19 reports
- Containers, Abnormal[a product quality report, not a sign in an animal]17.3%17 reports
- Death8.2%8 reports
- Vials, Leaking[a product quality report, not a sign in an animal]6.1%6 reports
- Ruminal bloat4.1%4 reports
- Lack of efficacy (bacteria) - NOS[the product did not have the expected effect: target not specified]3.1%3 reports
- Appearance, Abnormal[a product quality report, not a sign in an animal]2%2 reports
- Granules/Powder, Abnormal2%2 reports
- Color, Abnormal[a product quality report, not a sign in an animal]1%1 reports
- Conjunctivitis1%1 reports
- Containers, Leaking[a product quality report, not a sign in an animal]1%1 reports
- Cough1%1 reports
Show the next 12 signs
- Diarrhoea[diarrhea]1%1 reports
- Dyspnoea[difficulty breathing]1%1 reports
- Hepatopathy[liver disorder]1%1 reports
- Lack of efficacy (protozoa) - Coccidia[the product did not have the expected effect: coccidia]1%1 reports
- No sign[no clinical sign was reported]1%1 reports
- Odor, Abnormal[a product quality report, not a sign in an animal]1%1 reports
- Overdose[more than the labelled amount was given]1%1 reports
- Product problem[a product quality report, not a sign in an animal]1%1 reports
- Tablets, Abnormal[a product quality report, not a sign in an animal]1%1 reports
- Unpalatable[legacy FDA term: the animal would not take it]1%1 reports
- Unclassifiable adverse event[event that fits no dictionary term]1%1 reports
- Underfilling, Vials[a product quality report, not a sign in an animal]1%1 reports
The list shows 26 of 26 coded signs. A report is not proof that a drug caused a sign. Download all signs (CSV)
Reports by species
The share is of all 98 reports that name chlortetracycline hydrochloride. The other reports give a different species or no species.
Reports for each month, Jul 2021 to Jun 2026
No chart: no month has 5 or more reports.
No chart: no month has 5 or more reports.
No chart: no month has 5 or more 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
| Year | Dog | Cat | Horse | Other or not given | All species |
|---|---|---|---|---|---|
| 2025 | 0 | 0 | 0 | 1 | 1 |
| 2023 | 0 | 0 | 0 | 1 | 1 |
| 2015 | 0 | 0 | 0 | 1 | 1 |
| 2012 | 0 | 0 | 0 | 5 | 5 |
| 2011 | 0 | 0 | 0 | 1 | 1 |
| 2010 | 0 | 0 | 0 | 1 | 1 |
| 2009 | 0 | 0 | 0 | 4 | 4 |
| 2008 | 0 | 0 | 0 | 6 | 6 |
| 2007 | 0 | 0 | 0 | 6 | 6 |
| 2006 | 0 | 0 | 0 | 1 | 1 |
| 2005 | 0 | 0 | 0 | 10 | 10 |
| 2004 | 0 | 0 | 0 | 6 | 6 |
| 2003 | 0 | 0 | 0 | 13 | 13 |
| 2002 | 0 | 0 | 0 | 21 | 21 |
| 2001 | 0 | 0 | 0 | 5 | 5 |
| 2000 | 0 | 0 | 0 | 8 | 8 |
| 1999 | 0 | 0 | 0 | 4 | 4 |
| 1998 | 0 | 0 | 0 | 1 | 1 |
| 1997 | 0 | 0 | 0 | 2 | 2 |
| 1987 | 0 | 0 | 0 | 1 | 1 |
2025 has the reports that FDA received through Jul 2025. Download the years (CSV)
What the reports record
Outcome at the time of the report
- Recovered/Normal0%0
- Recovered with Sequela[recovered, with a lasting effect]0%0
- Ongoing0%0
- Died7.1%7
- Euthanized0%0
- Outcome Unknown3.1%3
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 98 reports that name chlortetracycline hydrochloride.
A report about more than one animal can have more than one outcome.
Kind of report
- Safety issue11.2%11
- Lack of expected effectiveness1%1
- Both safety and lack of expected effectiveness1%1
- Manufacturing or product defect86.7%85
- Other0%0
6 reports say if the event was serious. 66.7% 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 year4.1%4
- 1 to 3 years0%0
- 4 to 7 years0%0
- 8 to 11 years0%0
- 12 years and over0%0
- Age not given95.9%94
Weight of the animal
- Under 5 kg (11 lb)0%0
- 5 to 9.9 kg (11 to 22 lb)0%0
- 10 to 24.9 kg (22 to 55 lb)0%0
- 25 to 44.9 kg (55 to 99 lb)0%0
- 45 kg and over (99 lb and over)7.1%7
- Weight not given92.9%91
Breed, where the report gives one breed
A breed with many animals has many reports.
Route in the report
- Oral10.2%10
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
- ChlorMax
- Micro CTC
- Fermycin
- Chloronex
- Cltc
- Pennchlor 64
- Aureomycin
- CHLORTET-SOLUBLE-O
What the Green Book records give
- Applications with an approval in force
- 14
- Approved species
- Cattle, Swine, Chickens, Turkeys, Sheep, Unspecified
- Dose forms
- Type A Medicated Article, Soluble Powder, Bolus, Liquid (Solution), Powder, Solution, Tablet
- Routes
- Oral, Not Applicable
- Sale
- RX (prescription), VFD (veterinary feed directive), OTC (over the counter)
- 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.
| Brand name | Active ingredients | Sponsor | Approved species | Application |
|---|---|---|---|---|
| ChlorMax 50; ChlorMax 65; ChlorMax 70; ChlorMax 100; Micro CTC | Chlortetracycline Hydrochloride | Phibro Animal Health Corp. | Cattle, Swine, Chickens, Turkeys, Sheep | NADA 046-699 |
| Chlortetracycline | Chlortetracycline Hydrochloride | Huvepharma EOOD | Cattle | NADA 055-018 |
| Bulk Chlortetracycline Hydrochloride | Chlortetracycline Hydrochloride | Phibro Animal Health Corp. | Not in the list of major species | NADA 055-019 |
| Chlortetracycline | Chlortetracycline Hydrochloride | Huvepharma EOOD | Cattle | NADA 055-039 |
| Chlortetracycline Soluble Powder | Chlortetracycline Hydrochloride | Pharmgate Inc. | Cattle, Swine, Chickens, Turkeys | NADA 065-071 |
| Fermycin Soluble | Chlortetracycline Hydrochloride | Phibro Animal Health Corp. | Cattle, Swine, Chickens, Turkeys | NADA 065-178 |
| CHLORTET-SOLUBLE-O | Chlortetracycline Hydrochloride | Pharmgate Inc. | Swine, Chickens, Turkeys | NADA 065-256 |
| Chloronex | Chlortetracycline Hydrochloride | Pharmgate Inc. | Cattle, Swine, Chickens, Turkeys | NADA 065-440 |
| Chlortetracycline hydrochloride soluble powder | Chlortetracycline Hydrochloride | Pharmgate Inc. | Cattle, Swine | NADA 065-480 |
| Chlortetracycline Pneumonia/Calf Scour Bolus | Chlortetracycline Hydrochloride | Cronus Pharma Specialities India Private Ltd. | Cattle | NADA 065-481 |
| Cltc 50 MR; Cltc 100 MR | Chlortetracycline Hydrochloride | Phibro Animal Health Corp. | Cattle | NADA 092-287 |
| Chlortetracycline HCL Soluble Powder | Chlortetracycline Hydrochloride | Quo Vademus, LLC | Swine, Chickens, Turkeys | ANADA 200-236 |
| Pennchlor 64 | Chlortetracycline Hydrochloride | Pharmgate Inc. | Cattle, Swine, Chickens, Turkeys | ANADA 200-295 |
| Aureomycin | Chlortetracycline Hydrochloride | Pharmgate Inc. | Cattle, Swine, Chickens, Turkeys | ANADA 200-441 |
| Aureomycin SSapproval withdrawn | Chlortetracycline Hydrochloride | American Cyanamid, Division AHP Corp. | Not in the list of major species | NADA 055-017 |
| Keet Lifeapproval withdrawn | Chlortetracycline Hydrochloride | Hartz Mountain Products Corp. | Not in the list of major species | NADA 065-222 |
| Aureomycinapproval withdrawn | Chlortetracycline Hydrochloride | Roche Vitamins, Inc. | Not in the list of major species | NADA 093-372 |
Next in the A to Z list
FDA pages for this drug
- How to Report Animal Drug and Device Side Effects and Product ProblemsThe FDA page that tells an owner or a veterinarian how to send a report.
- Green Book record of NADA 046-699The FDA record of the application for ChlorMax 50, ChlorMax 65, ChlorMax 70, ChlorMax 100, Micro CTC.
- Green Book record of NADA 055-018The FDA record of the application for Chlortetracycline.
- Green Book record of NADA 055-039The FDA record of the application for Chlortetracycline.
- Green Book record of NADA 065-071The FDA record of the application for Chlortetracycline Soluble Powder.
- Green Book record of NADA 065-178The FDA record of the application for Fermycin Soluble.
- Green Book record of NADA 065-440The FDA record of the application for Chloronex.
- Animal Drugs @ FDAThe search page of the Green Book, the FDA list of approved animal drugs.
The site checked these addresses on . The links open in a new tab.
Cite this page
Pet Drug Reports. Chlortetracycline Hydrochloride: adverse event reports that FDA received. https://petdrugreports.com/drug/chlortetracycline-hydrochloride/ Source: FDA Center for Veterinary Medicine, openFDA Animal and Veterinary adverse event reports, export of . Reports received through .
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 1 report in the 12 months to June 2026. It received no 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 98 reports received from August 1987 to July 2025, 11.2% are about a safety issue only. 2% are about a lack of expected effectiveness, alone or with a safety issue. 86.7% are about a defect of the product or its package.