Afoxolaner + Milbemycin Oxime
22 adverse event reports submitted to the FDA
Active Ingredients
Administration Routes
Species Affected
Most Affected Breeds
Most Reported Reactions
Outcome Breakdown
Data Summary
| Metric | Value |
|---|---|
| Total adverse event reports | 22 |
| Reports involving death | 0 |
| Case-fatality rate (reported events) | 0.0% |
| Distinct species in reports | 1 |
| Distinct breeds in reports | 17 |
| Distinct reactions reported | 20 |
| Active ingredients on file | 3 |
Source: FDA Center for Veterinary Medicine — Adverse Event Reporting (CVM AER). Counts reflect voluntary reports only.
Afoxolaner + Milbemycin Oxime Adverse Event Insights
The FDA Center for Veterinary Medicine database currently holds 22 adverse event reports referencing Afoxolaner + Milbemycin Oxime, including 0 reports in which the animal died — a 0.0% case-fatality figure among reported events only, not a population-level mortality rate. Active ingredients on file: Afoxolaner, Afoxolaner + Milbemycin Oxime, Milbemycin Oxime. Reported administration routes include Oral, Unknown. These numbers reflect voluntary submissions from pet owners, veterinarians, and manufacturers and therefore under-represent mild events and over-represent severe ones — a pattern the FDA has documented repeatedly for pharmacovigilance datasets.
The species most frequently named in Afoxolaner + Milbemycin Oxime reports are Dog (22 reports), with Dog accounting for the largest share. Within those species, Retriever - Labrador (3), Beagle (2), Bulldog - French (2) appear most often — though breed popularity and ownership density shape these counts as much as any drug-specific sensitivity. This distribution matters because the same active ingredient can behave very differently across body sizes, ages, and species physiology.
The most commonly reported clinical signs associated with Afoxolaner + Milbemycin Oxime are Lack of efficacy (endoparasite) - heartworm (13), Abnormal ultrasound finding (3), Vomiting (3), Lethargy (see also Central nervous system depression in 'Neurological') (2). Of the 22 reports with a coded outcome, Outcome Unknown is the leading category at 63.6%. Because FDA adverse event data describes correlation rather than causation, these figures are best used to frame informed questions with a veterinarian and to compare reporting patterns across related products — not as a standalone safety verdict on Afoxolaner + Milbemycin Oxime.
Source: FDA Center for Veterinary Medicine — Adverse Event Reports FDA Center for Veterinary Medicine — Adverse Event Reports Data reflects voluntary submissions and may not represent actual incidence rates
Read our methodology — how this data is sourced, computed, and verified.