Drug profile

The FDA adverse-event record for Fenbendazol Suspension

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

868
adverse-event reports
38.5%
death-coded share
Dog
most-reported species
284
Death - 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.
868
Total Reports
334
Deaths Reported
38.5%
Death Rate

Active Ingredients

Fenbendazol Suspension

Administration Routes

OralUnknownTopicalSubcutaneousOtherIntravenousSubconjunctival

Species Affected

Dog 338
Cattle 312
Unknown 108
Cat 49
Goat 28
Human 11
Sheep 6
Snake 4
Pig 3
Alpaca 2

Most Affected Breeds

Cattle (other) 176
Unknown 130
Crossbred Canine/dog 58
Crossbred Bovine/Cattle 47
Aberdeen Angus 43
Domestic Shorthair 31
Dog (unknown) 23
Shepherd Dog - German 22
Beagle 20
Retriever - Golden 17

Most Reported Reactions

Death 284
Lack of efficacy - NOS 125
Diarrhoea 68
Lethargy (see also Central nervous system depression in 'Neurological') 59
Lack of efficacy (endoparasite) - hookworm 50
Containers, Leaking 44
Death by euthanasia 43
Drug administration error 41
Vomiting 40
Lack of efficacy (bacteria) - NOS 34
Emesis (multiple) 33
Seizure NOS 30

Outcome Breakdown

Ongoing
322 (30.6%)
Died
303 (28.7%)
Recovered/Normal
243 (23.1%)
Outcome Unknown
137 (13.0%)
Euthanized
44 (4.2%)
Recovered with Sequela
5 (0.5%)

Fenbendazol Suspension Adverse Event Insights

868 reports name Fenbendazol Suspension; 334 recorded a death outcome (38.5% of reported events, not a population-level mortality rate). Active ingredient: Fenbendazol Suspension. Administration routes: Oral, Unknown, Topical, Subcutaneous.

By species: Dog (338 reports), Cattle (312 reports), Unknown (108 reports). By breed: Cattle (other) (176), Unknown (130), Crossbred Canine/dog (58).

Leading clinical signs: Death (284), Lack of efficacy - NOS (125), Diarrhoea (68), Lethargy (see also Central nervous system depression in 'Neurological') (59). Outcome, 1,054 coded reports: Ongoing leads at 30.6%.

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.