Reaction profile

The FDA adverse-event record for allergic reaction

1,479 FDA adverse-event reports reference allergic reaction (VeDDRA 1304). See the species, breeds, and drugs most associated with it below.

1,479
reports citing this reaction
3.0%
death-coded share
Dog
most-affected species
Moxidectin
most-associated drug
Verify with FDA CVM →
1,479
Total Reports
44
Deaths
3.0%
Death Rate

Species Most Affected

Dog 1,333
Cat 57
Human 42
Horse 21
Cattle 17
Unknown 5
Pig 2
Ferret 1
Other 1

Breeds Most Affected

Retriever - Labrador 110
Terrier - Bull - American Pit 94
Dog (unknown) 88
Chihuahua 84
Boxer (German Boxer) 68
Unknown 52
Crossbred Canine/dog 50
Terrier - Yorkshire 42
Dachshund (unspecified) 42
Shih Tzu 41

Associated Drugs

Moxidectin 596
Afoxolaner 153
Rabies Virus, 96
Leptospira Canicola L-15 Strain C-51;Leptospira Grippotyphosa 1550 Lot 10005 Str 92
Fluralaner Chew Tablets 89
Milbemycin Oxime + Spinosad 81
Maropitant Citrate 66
Bordetella Bronchiseptica 92B 012992-7 Strain Boehringer Ingelheim 52
Diphenhydramine Hcl 45
Ivermectin + Pyrantel As Pamoate Salt 39
Pyrantel Pamoate;Sarolaner 37
Oclacitinib Maleate 36
Prednisone 33
Anti-Il31 Mab Mcs Lot #1283563 31
Carprofen 31
Milbemycin Oxime + Praziquantel 30
Spinosad 28
Polysulfated Glycosaminoglycan 27
Diphenhydramine 26
Cefovecin 26

Allergic reaction Reaction Insights

1,479 reports name Allergic reaction; 44 recorded a death outcome (3.0% of reported events, not a population-level mortality rate). VeDDRA code: 1304.

By species: Dog (1,333 reports), Cat (57 reports), Human (42 reports). By breed: Retriever - Labrador (110), Terrier - Bull - American Pit (94), Dog (unknown) (88).

Most co-reported drugs: Moxidectin (596 reports), Afoxolaner (153 reports), Rabies Virus, (96 reports), Leptospira Canicola L-15 Strain C-51;Leptospira Grippotyphosa 1550 Lot 10005 Str (92 reports).

Read these counts as reporting volume, not risk: per our methodology, co-reporting reflects temporal association captured in voluntary submissions, not proof that a drug caused this reaction. A widely-prescribed drug will rack up more raw co-reports at an identical true rate than a rarely-used one, so compare within similar-exposure products.

Source: FDA Center for Veterinary Medicine openFDA Animal & Veterinary Adverse Events (CVM AER) · 2025

Every figure on PlainBreed is rendered directly from FDA openFDA adverse event data, no number is typed in by an editor. This page draws directly on FDA openFDA data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.