Reaction profile
The FDA adverse-event record for ineffective, worms
465 FDA reports name ineffective, worms, a high-volume reaction in the CVM extract (VeDDRA 99160). Plate stamps and neighbourhood peers follow.
- #671 of 2,481
- by report volume (all reactions)
- 465
- reports citing this reaction
- 4.1%
- death-coded share
- Dog
- most-affected species
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. INEFFECTIVE, WORMS has 465 reports now versus 465 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 INEFFECTIVE, WORMS changesFDA AER · VeDDRA plate
Code 99160 VOL-LOW
VOL-LOW · DEATH-LOW · MID-PACK · PHOTO-FINISH · SPECIES-DOG · DRUG-LEAD · DESK-WIDE · BOOK-FULL
- VOL-LOW 465 reports
- DEATH-LOW 4.1%
- MID-PACK #671/2481
- PHOTO-FINISH Alkaline urine
- SPECIES-DOG Dog · 363
- DRUG-LEAD Ivermectin + Pyra… · 104
- DESK-WIDE 20 breeds
- BOOK-FULL 8/8 fields
Nearest volume peer: Alkaline urine (±0 reports)
Upper-third report volume drives the scale stamps on this plate; death-coded share and co-report peers follow. Not a clinical diagnosis.
High-volume neighbourhood around INEFFECTIVE, WORMS
Upper-third volume poles plus nearest peers, not a full reaction corpus board reprint.
INEFFECTIVE, WORMS: low death-coded share in the FDA AER plate
Signature read: INEFFECTIVE, WORMS's 4.1% death-coded share is among the lowest in the openFDA reaction corpus. Report volume is upper-third scale: 465 named reports in the openFDA extract. Death-coded share is lower-third: 19 of 465 reports (4.1% of named reports). Nearest volume peer: Alkaline urine (±0 reports). Lead species Dog (363). Lead co-reported drug Ivermectin + Pyrantel As Pamoate Salt (104).
Read these counts as reporting volume, not risk: per our methodology, Lead co-reported drug Ivermectin + Pyrantel As Pamoate Salt appears in filings alongside this reaction; that is association, not causation. Browse the full reactions index or the about page for how PlainBreed frames FDA CVM extracts.
Species Most Affected
Breeds Most Affected
Associated Drugs
Nationwide reactions with similar profiles
Two openFDA-derived peer sets for INEFFECTIVE, WORMS, both floored at ≥50 reports so the neighborhoods stay in the advertised mass (the volume chart above is the unfloored photo-finish strip).
Similar report volume
Nearest other reactions by FDA report count (465 here).
Similar death-coded share
Nearest other reactions by death-coded share (4.1% here), distinct from the volume row.
What to do with this reaction
- Compare INEFFECTIVE, WORMS's report profile against similar reactions nationwide. See similar reactions
- 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
Informational only. FDA adverse-event reports are voluntary and do not prove causation; consult a veterinarian before acting on them. Verify with FDA CVM →