Drug profile

The FDA adverse-event record for Onsior Injectable

11 adverse-event reports submitted to the FDA Center for Veterinary Medicine reference Onsior Injectable. See the species affected, top reactions, and outcomes below.

11
adverse-event reports
36.4%
death-coded share
Cat
most-reported species
6
Fever - 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.
11
Total Reports
4
Deaths Reported
36.4%
Death Rate

Active Ingredients

Onsior Injectable

Administration Routes

UnknownSubcutaneous

Species Affected

Cat 11

Most Affected Breeds

Domestic Shorthair 4
Domestic Mediumhair 3
Cat (unknown) 2
Cat (other) 1
Domestic Longhair 1

Most Reported Reactions

Fever 6
Proteinuria 5
Lameness 4
Not drinking 4
Not eating 4
Pain NOS 4
Ataxia 4
Intentional misuse 4
Elevated symmetrical dimethylarginine (SDMA) 3
Elevated creatinine 3
Hyperphosphataemia 3
Dehydration 2

Outcome Breakdown

Ongoing
6 (54.5%)
Euthanized
4 (36.4%)
Recovered/Normal
1 (9.1%)

Onsior Injectable Adverse Event Insights

11 reports name Onsior Injectable; 4 recorded a death outcome (36.4% of reported events, not a population-level mortality rate). Active ingredient: Onsior Injectable. Administration routes: Unknown, Subcutaneous.

By species: Cat (11 reports). By breed: Domestic Shorthair (4), Domestic Mediumhair (3), Cat (unknown) (2).

Leading clinical signs: Fever (6), Proteinuria (5), Lameness (4), Not drinking (4). Outcome, 11 coded reports: Ongoing leads at 54.5%.

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.