Drug profile

The FDA adverse-event record for Mometamax

39 adverse-event reports submitted to the FDA Center for Veterinary Medicine reference Mometamax. Species, reactions, and outcomes follow.

#1272 of 2,679
by report volume (all drugs)
39
adverse-event reports
7.7%
death-coded share
Dog
most-reported species
Verify with FDA CVM →

Corpus placement

According to the FDA Center for Veterinary Medicine openFDA adverse-event extract, Mometamax ranks #1263 of 2679 by total reports (39). Death-coded-share rank requires at least 50 reports. 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)
#1263
This drug, reports of 2679

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. Mometamax has 39 reports now versus 37 in that prior snapshot: 2 more (5.4%).

Report change
+2
Death-coded reports
+0
Death-coded share
−0.4 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 Mometamax changes

Signature read: death-coded share at 7.7% is the most distinctive stamp on Mometamax's FDA AER row.

Important: Adverse event reports do not establish that a drug caused or contributed to the event. Consult your veterinarian before making treatment decisions.
39
Total Reports
3
Deaths Reported
7.7%
Death-coded share of reports

Active Ingredients

Mometamax

Administration Routes

Auricular (Otic)UnknownTopical

Species Affected

Dog 37
Cat 2

Most Affected Breeds

Retriever - Labrador 6
Crossbred Canine/dog 4
Bulldog - French 2
Domestic Shorthair 2
Spaniel - King Charles Cavalier 2
Shepherd Dog - Anatolian 2
Spaniel - Cocker American 2
Boxer (German Boxer) 2
Shepherd Dog - Australian 1
Chihuahua 1

Most Reported Reactions

Lethargy (see also Central nervous system depression in Neurological) 7
Vomiting 4
Tremor 4
Ataxia 4
Panting 4
Unable to walk 4
Weight loss 3
Elevated alanine aminotransferase (ALT) 3
Haematuria 3
Urinary tract infection 3
Head tremor 3
Polydipsia 3

Outcome Breakdown

Ongoing
21 (53.8%)
Recovered/Normal
8 (20.5%)
Outcome Unknown
7 (17.9%)
Died
2 (5.1%)
Euthanized
1 (2.6%)

Mometamax Adverse Event Insights

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.

What to do with this drug

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 Mometamax (#1272 of 2,679 by report volume); death-coded 7.7%. PlainBreed drug row · death-coded share stamp 7.7% · 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 →