Drug profile

The FDA adverse-event record for Vaccines

251 adverse-event reports submitted to the FDA Center for Veterinary Medicine reference Vaccines. See the species affected, top reactions, and outcomes below.

251
adverse-event reports
9.2%
death-coded share
Dog
most-reported species
63
Lethargy (see also Central nervous system depression in 'Neurological') - top reaction
Verify with FDA CVM →
Important: Adverse event reports do not establish that a drug caused or contributed to the event. Consult your veterinarian before making treatment decisions.
251
Total Reports
23
Deaths Reported
9.2%
Death Rate

Active Ingredients

Vaccines

Administration Routes

UnknownSubcutaneousIntramuscularOral

Species Affected

Dog 195
Cat 50
Cattle 4
Horse 2

Most Affected Breeds

Domestic Shorthair 34
Retriever - Labrador 22
Chihuahua 14
Terrier - Yorkshire 13
Maltese 10
Shepherd Dog - Australian 10
Dog (unknown) 9
Crossbred Canine/dog 7
Shih Tzu 7
Domestic Longhair 6

Most Reported Reactions

Lethargy (see also Central nervous system depression in 'Neurological') 63
Vomiting 54
Diarrhoea 44
Anorexia 32
Other abnormal test result NOS 18
Emesis 18
Emesis (multiple) 18
Death 14
Seizure NOS 13
Not eating 13
Weight loss 11
Dehydration 11

Outcome Breakdown

Ongoing
84 (32.9%)
Recovered/Normal
81 (31.8%)
Outcome Unknown
67 (26.3%)
Died
15 (5.9%)
Euthanized
8 (3.1%)

Vaccines Adverse Event Insights

251 reports name Vaccines; 23 recorded a death outcome (9.2% of reported events, not a population-level mortality rate). Active ingredient: Vaccines. Administration routes: Unknown, Subcutaneous, Intramuscular, Oral.

By species: Dog (195 reports), Cat (50 reports), Cattle (4 reports). By breed: Domestic Shorthair (34), Retriever - Labrador (22), Chihuahua (14).

Leading clinical signs: Lethargy (see also Central nervous system depression in 'Neurological') (63), Vomiting (54), Diarrhoea (44), Anorexia (32). Outcome, 255 coded reports: Ongoing leads at 32.9%.

Read these counts as reporting volume, not risk: per our methodology, a widely-prescribed drug will rack up more raw FDA reports in a given year than a rarely-used one at an identical true rate, so we recommend comparing within similar-exposure products rather than across the full 2025 catalog.

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.