Drug profile

The FDA adverse-event record for Narasin, Nicarbazin

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

29
adverse-event reports
55.2%
death-coded share
Chicken
most-reported species
16
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.
29
Total Reports
16
Deaths Reported
55.2%
Death Rate

Active Ingredients

Narasin, Nicarbazin

Administration Routes

Oral

Species Affected

Chicken 27
Turkey 2

Most Affected Breeds

Chicken (unknown) 27
Turkey (unknown) 2

Most Reported Reactions

Death 16
Accidental exposure 10
Lack of efficacy (protozoa) - Coccidia 8
Loss of egg quantity 8
Residues in eggs 8
Anorexia 6
Inappropriate preparation of medication 5
Depression 3
Respiratory tract disorder NOS 3
Recumbency 2
Septicaemia 1
Enteritis 1

Outcome Breakdown

Died
16 (100.0%)

Narasin, Nicarbazin Adverse Event Insights

29 reports name Narasin, Nicarbazin; 16 recorded a death outcome (55.2% of reported events, not a population-level mortality rate). Active ingredient: Narasin, Nicarbazin. Administration route: Oral.

By species: Chicken (27 reports), Turkey (2 reports). By breed: Chicken (unknown) (27), Turkey (unknown) (2).

Leading clinical signs: Death (16), Accidental exposure (10), Lack of efficacy (protozoa) - Coccidia (8), Loss of egg quantity (8). Outcome, 16 coded reports: Died leads at 100.0%.

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.