Reaction profile

The FDA adverse-event record for lack of efficacy (endoparasite) - haemonchus

Name: Lack of efficacy (endoparasite) - Haemonchus - FDA Animal Adverse Reaction
Creator: PlainBreed
License: https://open.fda.gov/license/

24 FDA reports name lack of efficacy (endoparasite) - haemonchus, a lower-volume reaction in the CVM extract (VeDDRA 2797). Plate stamps and neighbourhood peers follow.

#2087 of 2,481
by report volume (all reactions): 24
reports citing this reaction: 33.3%
death-coded share: Cattle
most-affected species

Compiled by PlainBreed

Verify with FDA CVM →

Release-over-release change

What changed in the latest FDA data snapshot

PlainBreed reconstructed the prior snapshot from dated openFDA partitions through 2025 Q4, then compared it with the 2026-07-27 openFDA export. Lack of efficacy (endoparasite) - Haemonchus has 24 reports now versus 24 in that prior snapshot: 0 the same number of (0.0%).

Report change: +0
Death-coded reports: +0
Death-coded share: +0.0 pts

This compares reported-event counts in two source snapshots. It does not establish a change in real-world risk, product safety, or disease incidence.

Subscribe to Lack of efficacy (endoparasite) - Haemonchus changes

FDA AER · VeDDRA plate

Code 2797 VOL-TRACE

VOL-TRACE · DEATH-HOT · LOWER-Q · PHOTO-FINISH · SPECIES-CATTLE · DRUG-LEAD · DESK-WIDE · BOOK-FULL

VOL-TRACE 24 reports
DEATH-HOT 33.3%
LOWER-Q #2087/2481
PHOTO-FINISH Acute pancreatitis
SPECIES-CATTLE Cattle · 17
DRUG-LEAD Eprinomectin · 12
DESK-WIDE 11 breeds
BOOK-FULL 8/8 fields

Nearest volume peer: Acute pancreatitis (±0 reports)

Upper-third death-coded share drives the outcome stamps on this plate; volume band, corpus rank, and co-report peers follow. Not a clinical diagnosis.

Lower-volume neighbourhood around Lack of efficacy - Haemonchus

Lower-third volume poles plus nearest peers, not a full reaction corpus board reprint.

FDA AER report volume · neighbourhood around Lack of efficacy (endoparasite) - Haemonchus

Lack of efficacy (endoparasite) - Haemonchus: high death-coded share in the FDA AER plate

Signature read: 24 reports place Lack of efficacy (endoparasite) - Haemonchus in the lower third of FDA AER volume (#2087 of 2,481). Report volume is lower-third scale: 24 named reports in the openFDA extract. Death-coded share is upper-third: 8 of 24 reports (33.3% of named reports). Nearest volume peer: Acute pancreatitis (±0 reports). Lead species Cattle (17). Lead co-reported drug Eprinomectin (12).

Read these counts as reporting volume, not risk: per our methodology, A high death-coded share in FDA filings does not prove causation; co-reporting is voluntary temporal association only. Browse the full reactions index or the about page for how PlainBreed frames FDA CVM extracts.

Species Most Affected

Cattle 17

Sheep 5

Cat 1

Goat 1

Breeds Most Affected

Aberdeen Angus 6

Cattle (other) 5

Sheep (unknown) 3

Crossbred Bovine/Cattle 2

Cattle (unknown) 2

Domestic Shorthair 1

Mixed (Sheep) 1

Goat (unknown) 1

Beefmaster 1

Sheep (other) 1

Associated Drugs

Eprinomectin 12

Albendazole 3

Moxidectin 3

Oxfendazole 2

Fenbendazol Suspension 2

Fenbendazole 2

Selamectin 1

Bovine Parainfluenza 3 Virus, Modified Live Virus + Bovine Respiratory Syncytial Virus, Modified Live Virus + Bovine Rhinotracheitis Virus, Modified Live Virus + Bovine Virus Diarrhea Type 1, Modified Live Virus + Bovine Virus Diarrhea Type 2, Modified Live Virus + Mannheimia Haemolytica Toxoid 1

Clostridium Chauvoei Bacterin Toxoid + Clostridium Novyi Bacterin Toxoid + Clostridium Perfringens Type C Bacterin Toxoid + Clostridium Perfringens Type D Bacterin Toxoid + Clostridium Septicum Bacterin Toxoid + Clostridium Sordellii Bacterin Toxoid + Moraxella Bovis Bacterin Toxoid 1

Florfenicol/Flunixin Inj-Triac 1

Dexamethasone 1

Infectious Bovine Rhinotracheitis Virus(Ts), Rlb 106;Bovine Parainfluenza Virus 1

Bovine Parainfluenza 3, Pi3 Ebk-1/Ebht-1 Strain Al-Im;Infectious Bovine Rhinotra 1

Vira-Shield 6 1

Levamisole Hydrochloride;Doramectin 1

Clorsulon + Ivermectin 1

What to do with this reaction

Read how death-coded share differs from a mortality rate before drawing conclusions. Understanding adverse events
Browse the full reaction directory to compare report counts across reaction types. All reactions

A report does not prove a drug caused the reaction; consult a veterinarian before acting on this data.

Source: FDA Center for Veterinary Medicine openFDA Animal & Veterinary Adverse Events (CVM AER) · 2025

openFDA Animal & Veterinary Adverse Events (FDA CVM) for Lack of efficacy (endoparasite) - Haemonchus (#2087 of 2,481 by report volume); death-coded 33.3%. PlainBreed reaction plate · report volume stamp 24 · vintage 2025.

Informational only. FDA adverse-event reports are voluntary and do not prove causation; consult a veterinarian before acting on them. Verify with FDA CVM →