Reaction profile

The FDA adverse-event record for photosensitization

Name: Photosensitization - FDA Animal Adverse Reaction
Creator: PlainBreed
License: https://open.fda.gov/license/

21 FDA reports name photosensitization, a lower-volume reaction in the CVM extract (VeDDRA 956). Plate stamps and neighbourhood peers follow.

#2147 of 2,481
by report volume (all reactions): 21
reports citing this reaction: 23.8%
death-coded share: Cattle
most-affected species

Compiled by PlainBreed

Verify with FDA CVM →

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. Photosensitization has 21 reports now versus 21 in that prior snapshot: 0 the same number of (0.0%).

Report change: +0
Death-coded reports: +0
Death-coded share: +0.0 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 Photosensitization changes

FDA AER · VeDDRA plate

Code 956 VOL-TRACE

VOL-TRACE · DEATH-HOT · LOWER-Q · PHOTO-FINISH · SPECIES-CATTLE · DRUG-LEAD · DESK-WIDE · BOOK-FULL

VOL-TRACE 21 reports
DEATH-HOT 23.8%
LOWER-Q #2147/2481
PHOTO-FINISH Chewing - pruritus
SPECIES-CATTLE Cattle · 6
DRUG-LEAD Florfenicol · 4
DESK-WIDE 13 breeds
BOOK-FULL 8/8 fields

Nearest volume peer: Chewing - pruritus (±0 reports)

Instrument codes from this reaction’s FDA CVM adverse-event extract: volume band, death-coded share, corpus rank, photo-finish peer, lead species, lead drug, breed desk, and book completeness. Not a clinical diagnosis.

Lower-volume neighbourhood around Photosensitization

Lower-third volume poles plus nearest peers, not a full reaction corpus board reprint.

FDA AER report volume · neighbourhood around Photosensitization

What the FDA AER plate says about Photosensitization

Signature read: 21 reports place Photosensitization in the lower third of FDA AER volume (#2147 of 2,481). Report volume is lower-third scale: 21 named reports in the openFDA extract. 5 of 21 reports were death-coded (23.8% of named reports, not a population mortality rate). Nearest volume peer: Chewing - pruritus (±0 reports). Lead species Cattle (6). Lead co-reported drug Florfenicol (4).

Read these counts as reporting volume, not risk: per our methodology, Lead co-reported drug Florfenicol appears in filings alongside this reaction; that is association, not causation. Browse the full reactions index or the about page for how PlainBreed frames FDA CVM extracts.

Species Most Affected

Cattle 6

Cat 5

Fish 4

Dog 4

Horse 1

Sheep 1

Breeds Most Affected

Domestic (unspecified) 5

Unknown 3

Holstein-Friesian also known as Holstein 3

Fish (unknown) 1

Crossbred Canine/dog 1

Maltese 1

Pit Bull 1

Hereford cattle 1

Terrier - Boston 1

Aberdeen Angus 1

Associated Drugs

Florfenicol 4

Cefovecin Sodium 3

Spinosad 2

Doramectin 2

Eprinomectin 5% Injection 2

Tiletamine, Zolazepam 1

Carprofen 1

Cefpodoxime Proxetil 1

Eprinomectin 1

Albendazole 1

Oclacitinib Maleate 1

Monensin Sodium 1

Polysulfated Glycosaminoglycan 1

Bug Spray 1

What to do with this reaction

Read how death-coded share differs from a mortality rate before drawing conclusions. Understanding adverse events
Browse the full reaction directory to compare report counts across reaction types. All reactions

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 Photosensitization (#2147 of 2,481 by report volume); death-coded 23.8%. PlainBreed reaction plate · report volume stamp 21 · 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 →