Drug profile

The FDA adverse-event record for Tylosin

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

347
adverse-event reports
17.9%
death-coded share
Dog
most-reported species
51
Diarrhoea - 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.
347
Total Reports
62
Deaths Reported
17.9%
Death Rate

Active Ingredients

Tylosin

Administration Routes

OralUnknownParenteralIntramuscularSubcutaneousCutaneousTopicalIntraocularOtherRespiratory (Inhalation)

Species Affected

Dog 144
Human 51
Unknown 36
Chicken 34
Cattle 28
Pig 22
Cat 15
Turkey 6
Other Birds 4
Horse 3

Most Affected Breeds

Unknown 89
Chicken (unknown) 28
Pig (unknown) 12
Shih Tzu 10
Retriever - Labrador 9
Cattle (unknown) 8
Dog (unknown) 6
Turkey (unknown) 6
Retriever - Golden 6
Crossbred Canine/dog 6

Most Reported Reactions

Diarrhoea 51
Death 44
Lack of efficacy (bacteria) - NOS 36
Vomiting 25
Lack of efficacy - NOS 21
Death by euthanasia 21
Lethargy (see also Central nervous system depression in 'Neurological') 21
Anorexia 20
Accidental exposure 19
Unclassifiable adverse event 15
Behavioural disorder NOS 14
INEFFECTIVE, ANTIBIOTIC 14

Outcome Breakdown

Outcome Unknown
90 (31.4%)
Recovered/Normal
64 (22.3%)
Ongoing
64 (22.3%)
Died
48 (16.7%)
Euthanized
18 (6.3%)
Recovered with Sequela
3 (1.0%)

Tylosin Adverse Event Insights

347 reports name Tylosin; 62 recorded a death outcome (17.9% of reported events, not a population-level mortality rate). Active ingredient: Tylosin. Administration routes: Oral, Unknown, Parenteral, Intramuscular.

By species: Dog (144 reports), Human (51 reports), Unknown (36 reports). By breed: Unknown (89), Chicken (unknown) (28), Pig (unknown) (12).

Leading clinical signs: Diarrhoea (51), Death (44), Lack of efficacy (bacteria) - NOS (36), Vomiting (25). Outcome, 287 coded reports: Outcome Unknown leads at 31.4%.

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.