Drug profile

The FDA adverse-event record for Pergolide Mesylate

1,303 adverse-event reports submitted to the FDA Center for Veterinary Medicine reference Pergolide Mesylate. See the species affected, top reactions, and outcomes below.

1,303
adverse-event reports
6.1%
death-coded share
Horse
most-reported species
225
Anorexia - top reaction
Verify with FDA CVM →
Important: Adverse event reports do not establish that a drug caused or contributed to the event. Consult your veterinarian before making treatment decisions.
1,303
Total Reports
79
Deaths Reported
6.1%
Death Rate

Active Ingredients

Pergolide Mesylate

Administration Routes

OralUnknownTopicalOtherOropharyngealTransdermalSubcutaneous

Species Affected

Horse 1,129
Dog 76
Unknown 58
Human 22
Donkey 10
Cat 4
Mule 3
Cattle 1

Most Affected Breeds

Horse (unknown) 251
Quarter Horse 182
Arab 112
Unknown 96
Pony (unspecified) 83
Thoroughbred 55
Warmblood (unspecified) 51
Morgan 36
Miniature 36
Paint 34

Most Reported Reactions

Anorexia 225
Lethargy (see also Central nervous system depression in 'Neurological') 125
Diarrhoea 114
Behavioural disorder NOS 83
Lack of efficacy - NOS 73
Weight loss 72
Inappetence 65
Other abnormal test result NOS 61
Colic 59
Death by euthanasia 54
Depression 53
Accidental exposure 51

Outcome Breakdown

Outcome Unknown
637 (53.6%)
Recovered/Normal
368 (31.0%)
Ongoing
97 (8.2%)
Euthanized
43 (3.6%)
Died
37 (3.1%)
Recovered with Sequela
7 (0.6%)

Pergolide Mesylate Adverse Event Insights

1,303 reports name Pergolide Mesylate; 79 recorded a death outcome (6.1% of reported events, not a population-level mortality rate). Active ingredient: Pergolide Mesylate. Administration routes: Oral, Unknown, Topical, Other.

By species: Horse (1,129 reports), Dog (76 reports), Unknown (58 reports). By breed: Horse (unknown) (251), Quarter Horse (182), Arab (112).

Leading clinical signs: Anorexia (225), Lethargy (see also Central nervous system depression in 'Neurological') (125), Diarrhoea (114), Behavioural disorder NOS (83). Outcome, 1,189 coded reports: Outcome Unknown leads at 53.6%.

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.