Reaction profile

The FDA adverse-event record for myocarditis

63 FDA adverse-event reports reference myocarditis (VeDDRA 215). See the species, breeds, and drugs most associated with it below.

63
reports citing this reaction
85.7%
death-coded share
Dog
most-affected species
Monensin Sodium
most-associated drug
Verify with FDA CVM →
63
Total Reports
54
Deaths
85.7%
Death Rate

Species Most Affected

Dog 26
Cattle 19
Cat 16
Horse 1
Other Birds 1

Breeds Most Affected

Domestic Shorthair 10
Cattle (other) 7
Crossbred Bovine/Cattle 4
Corgi (unspecified) 4
Pointing Dog - Hungarian Short-haired (Vizsla) 3
Crossbred Canine/dog 3
Cattle (unknown) 3
Chihuahua 2
Domestic Mediumhair 2
Whippet 2

Associated Drugs

Monensin Sodium 12
Meloxicam 9
Tylosin Phosphate 7
Spinosad 7
Carprofen 6
Butorphanol 6
Isoflurane 6
Milbemycin Oxime + Spinosad 6
Buprenorphine 5
Famotidine 5
Omeprazole 5
Tulathromycin 4
Moxidectin 4
Maropitant Citrate 4
Sucralfate 4
Tiletamine-Zolazepam 4
Imidacloprid + Moxidectin 3
Enrofloxacin 3
Doramectin 3
Ractopamine Hydrochloride 3

Myocarditis Reaction Insights

63 reports name Myocarditis; 54 recorded a death outcome (85.7% of reported events, not a population-level mortality rate). VeDDRA code: 215.

By species: Dog (26 reports), Cattle (19 reports), Cat (16 reports). By breed: Domestic Shorthair (10), Cattle (other) (7), Crossbred Bovine/Cattle (4).

Most co-reported drugs: Monensin Sodium (12 reports), Meloxicam (9 reports), Tylosin Phosphate (7 reports), Spinosad (7 reports).

Read these counts as reporting volume, not risk: per our methodology, co-reporting reflects temporal association captured in voluntary submissions, not proof that a drug caused this reaction. A widely-prescribed drug will rack up more raw co-reports at an identical true rate than a rarely-used one, so compare within similar-exposure products.

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.