Drug profile

The FDA adverse-event record for Gamithromycin

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

309
adverse-event reports
60.8%
death-coded share
Cattle
most-reported species
172
Death - 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.
309
Total Reports
188
Deaths Reported
60.8%
Death Rate

Active Ingredients

Gamithromycin

Administration Routes

UnknownSubcutaneousIntramuscularParenteralTopicalIntravesicalIntraocular

Species Affected

Cattle 254
Unknown 24
Human 23
Sheep 3
Horse 2
Deer 1
Alpaca 1
Goat 1

Most Affected Breeds

Cattle (other) 135
Cattle (unknown) 57
Unknown 47
Aberdeen Angus 21
Crossbred Bovine/Cattle 15
Holstein-Friesian also known as Holstein 8
Brown Swiss 5
Hereford cattle 3
Horse (unknown) 2
Simmental 2

Most Reported Reactions

Death 172
Lack of efficacy - NOS 74
Lack of efficacy (bacteria) - NOS 65
Injection site swelling 27
Lameness 13
Injection site pain 13
Lack of efficacy (virus) - NOS 13
Recumbency 12
Vials, Damaged 12
Necropsy performed 12
Anorexia 11
Death by euthanasia 10

Outcome Breakdown

Died
185 (45.9%)
Outcome Unknown
91 (22.6%)
Recovered/Normal
66 (16.4%)
Ongoing
41 (10.2%)
Euthanized
12 (3.0%)
Recovered with Sequela
8 (2.0%)

Gamithromycin Adverse Event Insights

309 reports name Gamithromycin; 188 recorded a death outcome (60.8% of reported events, not a population-level mortality rate). Active ingredient: Gamithromycin. Administration routes: Unknown, Subcutaneous, Intramuscular, Parenteral.

By species: Cattle (254 reports), Unknown (24 reports), Human (23 reports). By breed: Cattle (other) (135), Cattle (unknown) (57), Unknown (47).

Leading clinical signs: Death (172), Lack of efficacy - NOS (74), Lack of efficacy (bacteria) - NOS (65), Injection site swelling (27). Outcome, 403 coded reports: Died leads at 45.9%.

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.