Drug profile

The FDA adverse-event record for Lufenuron + Milbemycin Oxime

8,207 adverse-event reports submitted to the FDA Center for Veterinary Medicine reference Lufenuron + Milbemycin Oxime. See the species affected, top reactions, and outcomes below.

8,207
adverse-event reports
1.9%
death-coded share
Dog
most-reported species
1,253
INEFFECTIVE, HEARTWORM LARVAE - 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.
8,207
Total Reports
154
Deaths Reported
1.9%
Death Rate

Active Ingredients

LufenuronMilbemycin Oxime

Administration Routes

OralUnknownTopicalOphthalmicOther

Species Affected

Dog 7,760
Unknown 410
Human 22
Cat 11
Wolf 2
Quail 1
Other Canids 1

Most Affected Breeds

Retriever - Labrador 1,156
Unknown 441
Shepherd Dog - German 439
Retriever - Golden 389
Crossbred Canine/dog 385
Chihuahua 248
Beagle 235
Dog (unknown) 232
Terrier - Yorkshire 213
Shih Tzu 206

Most Reported Reactions

INEFFECTIVE, HEARTWORM LARVAE 1,253
Lack of efficacy - NOS 962
INEFFECTIVE, HOOKS 879
Diarrhoea 715
Vomiting 701
Lethargy (see also Central nervous system depression in 'Neurological') 697
Lack of efficacy (endoparasite) - heartworm 615
Emesis 597
Lack of efficacy (endoparasite) - hookworm 504
INEFFECTIVE, ASCARIDS NOS 349
Lack of efficacy (heartworm) 338
Lack of efficacy (endoparasite) - whipworm 239

Outcome Breakdown

Outcome Unknown
3,296 (42.3%)
Recovered/Normal
2,821 (36.2%)
Ongoing
1,488 (19.1%)
Died
78 (1.0%)
Euthanized
76 (1.0%)
Recovered with Sequela
26 (0.3%)

Lufenuron + Milbemycin Oxime Adverse Event Insights

8,207 reports name Lufenuron + Milbemycin Oxime; 154 recorded a death outcome (1.9% of reported events, not a population-level mortality rate). Active ingredients: Lufenuron, Milbemycin Oxime. Administration routes: Oral, Unknown, Topical, Ophthalmic.

By species: Dog (7,760 reports), Unknown (410 reports), Human (22 reports). By breed: Retriever - Labrador (1,156), Unknown (441), Shepherd Dog - German (439).

Leading clinical signs: INEFFECTIVE, HEARTWORM LARVAE (1,253), Lack of efficacy - NOS (962), INEFFECTIVE, HOOKS (879), Diarrhoea (715). Outcome, 7,785 coded reports: Outcome Unknown leads at 42.3%.

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.