Drug profile

The FDA adverse-event record for Oxybendazole

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

121
adverse-event reports
5.8%
death-coded share
Horse
most-reported species
56
Colic - 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.
121
Total Reports
7
Deaths Reported
5.8%
Death Rate

Active Ingredients

Oxybendazole

Administration Routes

OralUnknownTopical

Species Affected

Horse 110
Unknown 6
Human 2
Donkey 2
Mule 1

Most Affected Breeds

Horse (unknown) 26
Quarter Horse 24
Arab 14
Thoroughbred 12
Unknown 10
Paint 6
Tennessee Walking Horse 4
Percheron 3
Appaloosa 2
Holsteiner 2

Most Reported Reactions

Colic 56
Diarrhoea 46
Lethargy (see also Central nervous system depression in 'Neurological') 19
Loose stool 17
Anorexia 14
Decreased appetite 12
Tachycardia 6
Fever 6
Decreased activity 5
Tachypnoea 5
Death by euthanasia 4
Depression 4

Outcome Breakdown

Recovered/Normal
72 (56.7%)
Outcome Unknown
34 (26.8%)
Ongoing
13 (10.2%)
Euthanized
4 (3.1%)
Died
3 (2.4%)
Recovered with Sequela
1 (0.8%)

Oxybendazole Adverse Event Insights

121 reports name Oxybendazole; 7 recorded a death outcome (5.8% of reported events, not a population-level mortality rate). Active ingredient: Oxybendazole. Administration routes: Oral, Unknown, Topical.

By species: Horse (110 reports), Unknown (6 reports), Human (2 reports). By breed: Horse (unknown) (26), Quarter Horse (24), Arab (14).

Leading clinical signs: Colic (56), Diarrhoea (46), Lethargy (see also Central nervous system depression in 'Neurological') (19), Loose stool (17). Outcome, 127 coded reports: Recovered/Normal leads at 56.7%.

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.