Drug profile

The FDA adverse-event record for Welactin

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

49
adverse-event reports
8.2%
death-coded share
Dog
most-reported species
6
Ataxia - top reaction
Verify with FDA CVM →
Important: Adverse event reports do not establish that a drug caused or contributed to the event. Consult your veterinarian before making treatment decisions.
49
Total Reports
4
Deaths Reported
8.2%
Death Rate

Active Ingredients

Welactin

Administration Routes

UnknownOral

Species Affected

Dog 47
Cat 2

Most Affected Breeds

Shepherd Dog - German 6
Whippet 4
Terrier - Bull - American Pit 3
Siberian Husky 3
Retriever - Labrador 3
Dachshund (unspecified) 2
Schipperke 2
Chihuahua 2
Cattle Dog - Australian (blue heeler, red heeler, Queensland cattledog) 2
Poodle - Miniature 2

Most Reported Reactions

Ataxia 6
Seizure NOS 5
Lethargy (see also Central nervous system depression in Neurological) 5
Stiffness NOS 4
Urine abnormalities NOS 4
Other abnormal test result NOS 4
Skin scab 4
Polydipsia 4
Lack of efficacy - NOS 3
Wound 3
Diarrhoea 3
Falling 3

Outcome Breakdown

Ongoing
26 (53.1%)
Recovered/Normal
13 (26.5%)
Outcome Unknown
6 (12.2%)
Died
2 (4.1%)
Euthanized
2 (4.1%)

Welactin Adverse Event Insights

49 reports name Welactin; 4 recorded a death outcome (8.2% of reported events, not a population-level mortality rate). Active ingredient: Welactin. Administration routes: Unknown, Oral.

By species: Dog (47 reports), Cat (2 reports). By breed: Shepherd Dog - German (6), Whippet (4), Terrier - Bull - American Pit (3).

Leading clinical signs: Ataxia (6), Seizure NOS (5), Lethargy (see also Central nervous system depression in Neurological) (5), Stiffness NOS (4). Outcome, 49 coded reports: Ongoing leads at 53.1%.

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.