Drug profile

The FDA adverse-event record for Unknown Steroid

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

#1179 of 2,679
by report volume (all drugs)
46
adverse-event reports
10.9%
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, Unknown Steroid ranks #1169 of 2679 by total reports (46). 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)
#1169
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. Unknown Steroid has 46 reports now versus 45 in that prior snapshot: 1 more (2.2%).

Report change
+1
Death-coded reports
+0
Death-coded share
−0.2 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 Unknown Steroid changes

Signature read: report volume at 46 is the most distinctive stamp on Unknown Steroid'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.
46
Total Reports
5
Deaths Reported
10.9%
Death-coded share of reports

Active Ingredients

Unknown Steroid

Administration Routes

UnknownOralSubcutaneousParenteral

Species Affected

Dog 23
Cat 22
Human 1

Most Affected Breeds

Domestic Shorthair 15
Retriever - Labrador 7
Crossbred Canine/dog 2
Domestic Longhair 2
Cat (unknown) 2
Dog (unknown) 2
Shepherd Dog - German 2
Foxhound - English 1
Havanese 1
Unknown 1

Most Reported Reactions

Lethargy (see also Central nervous system depression in 'Neurological') 4
Weight loss 4
Underdose 4
Anorexia 4
Diarrhoea 4
Ataxia 4
Skin lesion NOS 3
Application site erythema 3
Twitching 3
Urinary incontinence 3
Falling 3
Application site alopecia 3

Outcome Breakdown

Recovered/Normal
20 (43.5%)
Outcome Unknown
18 (39.1%)
Died
3 (6.5%)
Ongoing
3 (6.5%)
Euthanized
2 (4.3%)

Unknown Steroid 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 Unknown Steroid (#1179 of 2,679 by report volume); death-coded 10.9%. PlainBreed drug row · report volume stamp 46 · 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 →