Narasin; Nicarbazin
18 adverse event reports submitted to the FDA
Active Ingredients
Administration Routes
Species Affected
Most Affected Breeds
Most Reported Reactions
Outcome Breakdown
Data Summary
| Metric | Value |
|---|---|
| Total adverse event reports | 18 |
| Reports involving death | 2 |
| Case-fatality rate (reported events) | 1110.0% |
| Distinct species in reports | 1 |
| Distinct breeds in reports | 3 |
| Distinct reactions reported | 10 |
| Active ingredients on file | 1 |
Source: FDA Center for Veterinary Medicine — Adverse Event Reporting (CVM AER). Counts reflect voluntary reports only.
Narasin; Nicarbazin Adverse Event Insights
The FDA Center for Veterinary Medicine database currently holds 18 adverse event reports referencing Narasin; Nicarbazin, including 2 reports in which the animal died — a 1110.0% case-fatality figure among reported events only, not a population-level mortality rate. Active ingredient on file: Narasin; Nicarbazin. Reported administration route is Oral. These numbers reflect voluntary submissions from pet owners, veterinarians, and manufacturers and therefore under-represent mild events and over-represent severe ones — a pattern the FDA has documented repeatedly for pharmacovigilance datasets.
The species most frequently named in Narasin; Nicarbazin reports are Chicken (18 reports), with Chicken accounting for the largest share. Within those species, Chicken (other) (12), Cornish Cobb (3), Chicken (unknown) (3) appear most often — though breed popularity and ownership density shape these counts as much as any drug-specific sensitivity. This distribution matters because the same active ingredient can behave very differently across body sizes, ages, and species physiology.
The most commonly reported clinical signs associated with Narasin; Nicarbazin are Lack of efficacy (protozoa) - Coccidia (17), Overdose (3), Increased mortality rate (2), Digestive tract disorder NOS (1). Of the 20 reports with a coded outcome, Outcome Unknown is the leading category at 90.0%. Because FDA adverse event data describes correlation rather than causation, these figures are best used to frame informed questions with a veterinarian and to compare reporting patterns across related products — not as a standalone safety verdict on Narasin; Nicarbazin.
Source: FDA Center for Veterinary Medicine — Adverse Event Reports FDA Center for Veterinary Medicine — Adverse Event Reports Data reflects voluntary submissions and may not represent actual incidence rates
Read our methodology — how this data is sourced, computed, and verified.