Drug profile

The FDA adverse-event record for Dewormer (Unknown)

570 adverse-event reports submitted to the FDA Center for Veterinary Medicine reference Dewormer (Unknown). See the species affected, top reactions, and outcomes below.

570
adverse-event reports
4.4%
death-coded share
Dog
most-reported species
163
Emesis - 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.
570
Total Reports
25
Deaths Reported
4.4%
Death Rate

Active Ingredients

Dewormer (Unknown)

Administration Routes

OralUnknownParenteralTopicalIntraocular

Species Affected

Dog 467
Cat 88
Cattle 12
Goat 2
Chicken 1

Most Affected Breeds

Domestic Shorthair 59
Retriever - Labrador 59
Pit Bull 25
Chihuahua 25
Crossbred Canine/dog 25
Boxer (German Boxer) 17
Terrier - Yorkshire 17
Retriever - Golden 17
Shepherd Dog - German 16
Beagle 14

Most Reported Reactions

Emesis 163
Vomiting 131
Lethargy (see also Central nervous system depression in 'Neurological') 90
Diarrhoea 61
Lack of efficacy (ectoparasite) - flea 42
Lack of efficacy - NOS 30
Lack of efficacy (endoparasite) - hookworm 29
Emesis (multiple) 24
Behavioural disorder NOS 20
Decreased appetite 19
Not eating 19
Loose stool 17

Outcome Breakdown

Recovered/Normal
291 (50.7%)
Outcome Unknown
163 (28.4%)
Ongoing
71 (12.4%)
Recovered with Sequela
24 (4.2%)
Died
17 (3.0%)
Euthanized
8 (1.4%)

Dewormer (Unknown) Adverse Event Insights

570 reports name Dewormer (Unknown); 25 recorded a death outcome (4.4% of reported events, not a population-level mortality rate). Active ingredient: Dewormer (Unknown). Administration routes: Oral, Unknown, Parenteral, Topical.

By species: Dog (467 reports), Cat (88 reports), Cattle (12 reports). By breed: Domestic Shorthair (59), Retriever - Labrador (59), Pit Bull (25).

Leading clinical signs: Emesis (163), Vomiting (131), Lethargy (see also Central nervous system depression in 'Neurological') (90), Diarrhoea (61). Outcome, 574 coded reports: Recovered/Normal leads at 50.7%.

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.