Folic Acid: adverse event reports that FDA received
Active ingredient
The Green Book lists no brand name for exactly this active ingredient.
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 March 2016 to January 2026, FDA received 33 adverse event reports that name a drug with folic acid as its active ingredient. Of the 33 reports, 26 (78.8%) are about dogs. 4 reports are about cats (12.1%).
In January to March 2026, FDA received 1 report that names this drug. The signs that appear in the largest number of the 33 reports are "Vomiting", "Other abnormal test result NOS" and "Weight loss". 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. Reports about dogs are 78.8% of the reports that name this drug, and 72.6% of all reports.
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 1 report that names folic acid: 0 dog, 0 cat, 0 horse, 1 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 33 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.
- Vomiting27.3%9 reports
- Other abnormal test result NOS[abnormal laboratory result, type not specified]18.2%6 reports
- Weight loss18.2%6 reports
- Anaemia NOS[low red blood cell count]15.2%5 reports
- Diarrhoea[diarrhea]15.2%5 reports
- Lethargy[unusually tired or inactive]15.2%5 reports
- Abnormal radiograph finding12.1%4 reports
- Anorexia[not eating]12.1%4 reports
- Fever12.1%4 reports
- Ataxia[unsteady, uncoordinated movement]9.1%3 reports
- Behavioural disorder NOS[behaviour change, type not specified]9.1%3 reports
- Death9.1%3 reports
- Eosinophilia9.1%3 reports
- Exocrine pancreatic insufficiency9.1%3 reports
Show the next 16 signs
- Immune mediated haemolytic anaemia[the immune system destroying red blood cells]9.1%3 reports
- Lameness9.1%3 reports
- Limb weakness9.1%3 reports
- Monocytosis[high monocyte count]9.1%3 reports
- Abnormal cytology6.1%2 reports
- Abnormal ultrasound finding6.1%2 reports
- Accidental exposure[exposure that was not intended]6.1%2 reports
- Constipation6.1%2 reports
- Difficulty to rise6.1%2 reports
- Digestive tract disorder NOS[digestive problem, type not specified]6.1%2 reports
- Disorientation6.1%2 reports
- Elevated liver enzymes[liver enzymes above the normal range]6.1%2 reports
- Elevated total bilirubin[bilirubin above the normal range]6.1%2 reports
- Gait abnormality6.1%2 reports
- Infectious disease NOS[NOS: not otherwise specified]6.1%2 reports
- Intestinal disorder NOS[NOS: not otherwise specified]6.1%2 reports
The list shows 30 of 130 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 33 reports that name folic acid. 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 |
|---|---|---|---|---|---|
| 2026 | 0 | 0 | 0 | 1 | 1 |
| 2025 | 5 | 0 | 0 | 0 | 5 |
| 2024 | 0 | 1 | 0 | 0 | 1 |
| 2023 | 1 | 0 | 0 | 1 | 2 |
| 2022 | 5 | 1 | 0 | 1 | 7 |
| 2021 | 2 | 0 | 0 | 0 | 2 |
| 2020 | 1 | 0 | 0 | 0 | 1 |
| 2019 | 2 | 0 | 0 | 0 | 2 |
| 2018 | 4 | 0 | 0 | 0 | 4 |
| 2017 | 4 | 1 | 0 | 0 | 5 |
| 2016 | 2 | 1 | 0 | 0 | 3 |
2026 has the reports that FDA received through Jan 2026. Download the years (CSV)
What the reports record
Outcome at the time of the report
- Recovered/Normal27.3%9
- Recovered with Sequela[recovered, with a lasting effect]3%1
- Ongoing45.5%15
- Died12.1%4
- Euthanized0%0
- Outcome Unknown15.2%5
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 33 reports that name folic acid.
A report about more than one animal can have more than one outcome.
Kind of report
- Safety issue90.9%30
- Lack of expected effectiveness0%0
- Both safety and lack of expected effectiveness9.1%3
- Manufacturing or product defect0%0
- Other0%0
32 reports say if the event was serious. 50% 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 year3%1
- 1 to 3 years6.1%2
- 4 to 7 years12.1%4
- 8 to 11 years39.4%13
- 12 years and over33.3%11
- Age not given6.1%2
Weight of the animal
- Under 5 kg (11 lb)27.3%9
- 5 to 9.9 kg (11 to 22 lb)6.1%2
- 10 to 24.9 kg (22 to 55 lb)15.2%5
- 25 to 44.9 kg (55 to 99 lb)33.3%11
- 45 kg and over (99 lb and over)12.1%4
- Weight not given6.1%2
Breed, where the report gives one breed
- Labrador Retriever9.1%3
- German Shepherd Dog9.1%3
- Domestic Shorthair6.1%2
- Coton de Tuléar6.1%2
- Golden Retriever6.1%2
- Bulldog3%1
- Chihuahua3%1
- Welsh Pembroke Corgi3%1
A breed with many animals has many reports.
Route in the report
- Oral33.3%11
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.
No approved product has exactly this set of active ingredients. The ingredient field of a report can be incomplete. The approved products below have all the ingredients of this page and one or more other ingredients.
| Brand name | Active ingredients | Sponsor | Approved species | Application |
|---|---|---|---|---|
| Tylan Plus Vitaminsapproval withdrawn | Folic Acid, Pyridoxine Hydrochloride, Tylosin, Vitamin A, Vitamin B1, Vitamin B2, Vitamin B5, Vitamin D, Vitamin E | Elanco Animal Health, A Division of Eli Lilly & Co. | Not in the list of major species | NADA 013-029 |
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.
- 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. Folic Acid: adverse event reports that FDA received. https://petdrugreports.com/drug/folic-acid/ 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 lists no brand name for exactly 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 6 reports 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 33 reports received from March 2016 to January 2026, 90.9% are about a safety issue only. 9.1% are about a lack of expected effectiveness, alone or with a safety issue.