Reaction profile
The FDA adverse-event record for difficulty of use
3,272 FDA reports name difficulty of use, a high-volume reaction in the CVM extract (VeDDRA 99955). Plate stamps and neighbourhood peers follow.
- #142 of 2,481
- by report volume (all reactions)
- 3,272
- reports citing this reaction
- 0.2%
- death-coded share
- Unknown
- 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. Difficulty of Use has 3,272 reports now versus 3,272 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 Difficulty of Use changesFDA AER · VeDDRA plate
Code 99955 VOL-MID
VOL-MID · DEATH-RARE · TOP-DECILE · PHOTO-FINISH · SPECIES-UNKNOWN · DRUG-LEAD · DESK-WIDE · BOOK-FULL
- VOL-MID 3,272 reports
- DEATH-RARE 0.2%
- TOP-DECILE #142/2481
- PHOTO-FINISH Appetite loss
- SPECIES-UNKNOWN Unknown · 2,811
- DRUG-LEAD Milbemycin Oxime… · 540
- DESK-WIDE 20 breeds
- BOOK-FULL 8/8 fields
Nearest volume peer: Appetite loss (±1 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 Difficulty of Use
Upper-third volume poles plus nearest peers, not a full reaction corpus board reprint.
Difficulty of Use: low death-coded share in the FDA AER plate
Signature read: 3,272 reports place Difficulty of Use in the upper third of FDA AER volume (#142 of 2,481). Report volume is upper-third scale: 3,272 named reports in the openFDA extract. Death-coded share is lower-third: 5 of 3,272 reports (0.2% of named reports). Nearest volume peer: Appetite loss (±1 reports). Lead species Unknown (2,811). Lead co-reported drug Milbemycin Oxime + Spinosad (540).
Read these counts as reporting volume, not risk: per our methodology, Lead co-reported drug Milbemycin Oxime + Spinosad 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 Difficulty of Use, 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 (3,272 here).
Similar death-coded share
Nearest other reactions by death-coded share (0.2% here), distinct from the volume row.
What to do with this reaction
- Compare Difficulty of Use'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 →