Drug profile

The FDA adverse-event record for Levamisole

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

20
adverse-event reports
55.0%
death-coded share
Sheep
most-reported species
8
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.
20
Total Reports
11
Deaths Reported
55.0%
Death Rate

Active Ingredients

Levamisole

Administration Routes

OralUnknown

Species Affected

Sheep 8
Goat 4
Horse 2
Unknown 2
Cat 2
Human 1
Dog 1

Most Affected Breeds

Sheep (unknown) 6
Unknown 4
Goat (unknown) 2
Domestic Shorthair 2
Crossbred Equine/horse 1
Thoroughbred 1
Nubian 1
Southdown 1
Bulldog - French 1
Crossbred Ovine/sheep 1

Most Reported Reactions

Death 8
Ataxia 4
Overdose 4
Neurological symptoms NOS 3
Neurological signs NOS 2
Staggering 2
Behavioural disorder NOS 2
Twitching 2
Collapse NOS (see also 'Cardio-vascular' and 'Neurological disorders') 2
Vestibular disorder NOS 2
Not eating 2
Not drinking 2

Outcome Breakdown

Died
10 (47.6%)
Outcome Unknown
4 (19.0%)
Recovered/Normal
3 (14.3%)
Ongoing
3 (14.3%)
Euthanized
1 (4.8%)

Levamisole Adverse Event Insights

20 reports name Levamisole; 11 recorded a death outcome (55.0% of reported events, not a population-level mortality rate). Active ingredient: Levamisole. Administration routes: Oral, Unknown.

By species: Sheep (8 reports), Goat (4 reports), Horse (2 reports). By breed: Sheep (unknown) (6), Unknown (4), Goat (unknown) (2).

Leading clinical signs: Death (8), Ataxia (4), Overdose (4), Neurological symptoms NOS (3). Outcome, 21 coded reports: Died leads at 47.6%.

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.