Drug profile

The FDA adverse-event record for Milbemycin Oxime & Lufenuron

538 FDA reports name Milbemycin Oxime & Lufenuron, a high-volume drug in the CVM extract. Species, reactions, and outcomes follow.

#288 of 2,679
by report volume (all drugs)
538
adverse-event reports
4.1%
death-coded share
Dog
most-reported species

Corpus placement

According to the FDA Center for Veterinary Medicine openFDA adverse-event extract, Milbemycin Oxime & Lufenuron ranks #287 of 2679 by total reports (538) and #840 of 1130 by death-coded share (4.1%). National dual: Milbemycin Oxime + Spinosad is #1 of 2679 drugs by total adverse-event reports (149,624) at death-coded-share rank 965 of 1130 drugs with at least 50 reports (2.3%); separately, Atlantic Salmon Transgenic Whole (Opafp-Ghc2 Rdna Construct Inserted Into The A-Locus In The Eo-1A Lineage) is #1 highest death-coded share at 97.8% (report rank #821).

149,624
Milbemycin Oxime + Spinosad reports (#1)
97.8%
Atlantic Salmon Transgenic Whole (Opafp-Ghc2 Rdna Construct Inserted Into The A-Locus In The Eo-1A Lineage) death share (#1)
#287
This drug, reports of 2679
#840
This drug, death share of 1130

Report volume reflects how common a breed or drug is and how often owners and vets file — not actual risk. Death-coded share ranks are limited to entries with enough reports to be meaningful. The two maps do not agree at #1.

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. Milbemycin Oxime & Lufenuron has 538 reports now versus 538 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 Milbemycin Oxime & Lufenuron changes

Signature read: 538 reports place Milbemycin Oxime & Lufenuron in the upper third of FDA AER volume (#288 of 2,679).

Important: Adverse event reports do not establish that a drug caused or contributed to the event. Consult your veterinarian before making treatment decisions.
538
Total Reports
22
Deaths Reported
4.1%
Death-coded share of reports

Active Ingredients

Milbemycin Oxime & Lufenuron

Administration Routes

OralUnknown

Species Affected

Dog 537
Cat 1

Most Affected Breeds

Retriever - Labrador 91
Retriever - Golden 33
Shepherd Dog - German 22
Beagle 20
Terrier - Bull - American Pit 19
Chihuahua 18
Shih Tzu 17
Shepherd Dog - Australian 12
Terrier - Yorkshire 12
Maltese 12

Most Reported Reactions

Lack of efficacy (endoparasite) - heartworm 109
Vomiting 95
Lethargy (see also Central nervous system depression in 'Neurological') 81
Seizure NOS 56
Diarrhoea 41
Lack of efficacy - NOS 36
Tremor 34
INEFFECTIVE, HEARTWORM LARVAE 30
Anorexia 29
Other abnormal test result NOS 23
Elevated alanine aminotransferase (ALT) 23
Ataxia 19

Outcome Breakdown

Ongoing
353 (65.6%)
Recovered/Normal
100 (18.6%)
Outcome Unknown
63 (11.7%)
Died
12 (2.2%)
Euthanized
10 (1.9%)

Milbemycin Oxime & Lufenuron: low death-coded share in the FDA AER row

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.

High-volume nationwide drug peers

Two openFDA-derived peer sets for Milbemycin Oxime & Lufenuron, both floored at ≥50 reports so the neighborhoods stay in the advertised mass.

What to do with this drug

  • Compare Milbemycin Oxime & Lufenuron's report volume and death-coded share against similar drugs nationwide. See similar drugs
  • Read how death-coded share differs from a mortality rate before drawing conclusions. Understanding adverse events
  • Browse the full drug directory to compare report counts across products. All drugs

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 Milbemycin Oxime & Lufenuron (#288 of 2,679 by report volume); death-coded 4.1%. PlainBreed drug row · report volume stamp 538 · 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 →