April 2026: adverse event reports that FDA received
Month in which FDA received the reports
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 .
FDA received 7,248 adverse event reports for animal drugs in April 2026. It received 7,058 reports in April 2025. The average of the 12 months before April 2026 is 6,496 reports for each month.
Of the 7,248 reports, 74.6% are about dogs, 14.3% are about cats and 1.5% are about horses. The other reports are about other species, or give no species. A report is not proof that a drug caused a sign.
Search engines do not list month pages. The site keeps the page, and the list of months links it.
The months before and after
Reports by species
- Dog74.6%5,410
- Cat14.3%1,038
- Horse1.5%109
- Other species, or species not given9.5%691
Drug pages with reports received in April 2026
The table has every drug page with 10 or more reports that FDA received in April 2026, in order of name. No count decides which drug is in the table. The table has 112 drug pages.
Show the 112 drug pages
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.
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.
Commonly used products may have a higher number of reported adverse events due to the higher total number of animals being given the product.
FDA Center for Veterinary Medicine. Source: Adverse Event Reports for Animal Drugs and Devices
Signs that the reports of the month 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 7,248 reports of the month.
The sign that is in the largest number of the reports comes first.
- Vomiting10.6%769 reports
- Lack of efficacy (ectoparasite) - flea[the product did not have the expected effect: fleas]8.8%637 reports
- Lethargy[unusually tired or inactive]8.4%606 reports
- Lack of efficacy (endoparasite) - heartworm[the product did not have the expected effect: heartworm]6.5%471 reports
- Lack of efficacy (bacteria) - Borrelia[the product did not have the expected effect: Borrelia (Lyme disease bacteria)]6.2%449 reports
- Diarrhoea[diarrhea]5.9%429 reports
- Lack of efficacy - NOS[the product did not have the expected effect]5.9%427 reports
- Lack of efficacy (endoparasite) - hookworm[the product did not have the expected effect: hookworms]5.7%414 reports
- Lack of efficacy (ectoparasite) - tick NOS[the product did not have the expected effect: ticks]4.3%314 reports
- Medication error NOS[a mistake in giving the product, type not specified]4.2%305 reports
- Seizure NOS[seizure, type not specified]3.7%271 reports
- Emesis (multiple)[vomiting more than once]3.5%252 reports
- Lack of efficacy (bacteria) - Anaplasma[the product did not have the expected effect: Anaplasma bacteria]3.3%240 reports
- Intentional misuse[use that was knowingly different from the label]3%218 reports
Show the next 1 signs
- Death2.6%192 reports
Ingredients, all combinations
The list has every active ingredient with 10 or more reports received in April 2026, in order of name. It has 114 ingredients.
Show the 114 ingredients
- (S) - methoprene
- Acepromazine Maleate
- Afoxolaner
- Alfaxalone
- Amlodipine
- Amoxicillin
- Amoxicillin Trihydrate
- Atinvicitinib
- Atipamezole Hydrochloride
- Bedinvetmab
- Benazepril
- Betamethasone Acetate
- Bexagliflozin
- Buprenorphine
- Butorphanol Tartrate
- Capromorelin
- Carprofen
- Cefovecin sodium
- Cefpodoxime proxetil
- Ceftiofur Crystalline Free Acid
- Ceftiofur Sodium
- Clavulanate Potassium
- Clindamycin
- Clotrimazole
- Cyclosporine
- Detomidine Hydrochloride
- Dexamethasone
- Dexmedetomidine
- Dexmedetomidine hydrochloride
- Diphenhydramine
- Doramectin
- Doxycycline
- Emodepside
- Enalapril Maleate
- Enrofloxacin
- Eprinomectin
- Esafoxolaner
- Estriol
- Famotidine
- Febantel
- Fenbendazole
- Firocoxib
- Florfenicol
- Flunixin Meglumine
- Fluoxetine hydrochloride
- Fluralaner
- Frunevetmab
- Furosemide
- Gabapentin
- Gentamicin Sulfate
- Grapiprant
- Ilunocitinib
- Imidacloprid
- Insulin
- Isoflurane
- Ivermectin
- Ketamine Hydrochloride
- Ketoconazole
- Levetiracetam
- Levothyroxine sodium
- Lotilaner
- Lufenuron
- Maropitant
- Medetomidine hydrochloride
- Melarsomine Dihydrochloride
- Meloxicam
- Methimazole
- Methocarbamol
- Methylprednisolone Acetate
- Metronidazole
- Miconazole Nitrate
- Midazolam
- Milbemycin Oxime
- Mirtazapine
- Molidustat
- Mometasone furoate
- Moxidectin
- Neomycin Sulfate
- Nitenpyram
- Nystatin
- Oclacitinib
- Omeprazole
- Ondansetron
- Pergolide mesylate
- Phenylpropanolamine hydrochloride
- Pimobendan
- Polysulfated Glycosaminoglycan
- Praziquantel
- Prednisolone
- Prednisone
- Propofol
- Pyrantel Pamoate
- Robenacoxib
- Salicylic Acid
- Sarolaner
- Selamectin
- Sevoflurane
- Sodium Chloride
- Spinosad
- Sucralfate
- Terbinafine
- Thiabendazole
- Thiostrepton
- Tigilanol tiglate
- Tiletamine Hydrochloride
- Tramadol
- Trazodone
- Triamcinolone Acetonide
- Trilostane
- Tulathromycin
- Ursodiol
- Vatinoxan hydrochloride
- Velagliflozin
- Zolazepam Hydrochloride
The same month in other years
Cite this page
Pet Drug Reports. April 2026: adverse event reports for animal drugs. https://petdrugreports.com/month/2026-04/ 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 month is the month in which FDA received the report, not the month of the event.
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 this month
- Can the count for April 2026 change?
Yes. 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.
- Does the month show when the event occurred?
No. The month is the month in which FDA received the report. The event can be from an earlier month.
- Which sign is in the largest number of the reports of the month?
"Vomiting" is in 769 reports of the 7,248 reports of April 2026 (10.6%).