Drug profile

The FDA adverse-event record for Afoxolaner 136 Mg Chewable Tablets

1,245 adverse-event reports submitted to the FDA Center for Veterinary Medicine reference Afoxolaner 136 Mg Chewable Tablets. See the species affected, top reactions, and outcomes below.

1,245
adverse-event reports
2.7%
death-coded share
Dog
most-reported species
236
Vomiting - top reaction
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Important: Adverse event reports do not establish that a drug caused or contributed to the event. Consult your veterinarian before making treatment decisions.
1,245
Total Reports
34
Deaths Reported
2.7%
Death Rate

Active Ingredients

Afoxolaner 136 Mg Chewable Tablets

Administration Routes

OralUnknownOther

Species Affected

Dog 1,163
Unknown 80
Cat 2

Most Affected Breeds

Retriever - Labrador 226
Shepherd Dog - German 125
Retriever - Golden 113
Unknown 94
Crossbred Canine/dog 94
Dog (unknown) 65
Rottweiler 48
Pit Bull 39
Boxer (German Boxer) 33
Mixed (Dog) 27

Most Reported Reactions

Vomiting 236
Skin disorders NOS 211
Lack of efficacy (tick) 202
Lack of efficacy (flea) 137
Diarrhoea 122
Pruritus 117
Lethargy (see also Central nervous system depression in 'Neurological') 106
Scratching 57
Panting 51
Anorexia 43
Itching 40
Lack of efficacy (ectoparasite) - NOS 39

Outcome Breakdown

Outcome Unknown
663 (56.9%)
Recovered/Normal
402 (34.5%)
Ongoing
63 (5.4%)
Died
23 (2.0%)
Euthanized
11 (0.9%)
Recovered with Sequela
4 (0.3%)

Afoxolaner 136 Mg Chewable Tablets Adverse Event Insights

1,245 reports name Afoxolaner 136 Mg Chewable Tablets; 34 recorded a death outcome (2.7% of reported events, not a population-level mortality rate). Active ingredient: Afoxolaner 136 Mg Chewable Tablets. Administration routes: Oral, Unknown, Other.

By species: Dog (1,163 reports), Unknown (80 reports), Cat (2 reports). By breed: Retriever - Labrador (226), Shepherd Dog - German (125), Retriever - Golden (113).

Leading clinical signs: Vomiting (236), Skin disorders NOS (211), Lack of efficacy (tick) (202), Lack of efficacy (flea) (137). Outcome, 1,166 coded reports: Outcome Unknown leads at 56.9%.

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.