melarsomine dihydrochloride — FDA Animal & Veterinary ADE Reports by Species (Dog vs Cat)
Source: openFDA animalandveterinary/event.json, the FDA Center for Veterinary Medicine (CVM) adverse event report database. Data pulled 2026-08-16. This topic covers adverse-event reports for the active ingredient Melarsomine Dihydrochloride (queried as drug.active_ingredients.name). Overall report total for this ingredient: 22192. Counts are report-level: one report may list multiple reactions and multiple animals, so figures are not additive and do not imply causation. "Serious" follows the FDA serious_ae flag. Species values are as filed in each report. The Dog and Cat figures below are subsets of this ingredient's overall report total and do not necessarily sum to it (other species and reports with no species listed are excluded).
Dog (21140 reports)
- Serious adverse events (FDA
serious_aeflag): 8178 (38.7% of 21140) - Top reported reactions (VEDDRA terms):
- INEFFECTIVE, HEARTWORM ADULTS 3883
- Vomiting 2596
- Lack of efficacy (endoparasite) - heartworm 2382
- Injection site swelling 2216
- Injection site pain 1378
Cat (6 reports)
- Serious adverse events (FDA
serious_aeflag): 2 (33.3% of 6) - Top reported reactions (VEDDRA terms):
- Death 5
- Accidental exposure 3
- Depression 2
- Respiratory distress 2
- Vocalisation 2
Honest scope note
This topic is a species cross-section of FDA adverse-event reports for a single active ingredient, queried by drug.active_ingredients.name. Figures are aggregates of spontaneously reported adverse events and reflect reporting volume, not incidence or risk per animal treated. "Lack of efficacy" and similar terms denote product-performance reports, not adverse reactions. Different marketed presentations of the same compound (e.g. chewable vs spot-on) may be filed under distinct name strings in openFDA and are not merged here. Source JSON: pdf-raw/ade/ade_species_slice_expand_2026-08-16.json (openFDA animalandveterinary/event.json, pulled 2026-08-16).