Drug profile

The FDA adverse-event record for Lasix

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

93
adverse-event reports
30.1%
death-coded share
Dog
most-reported species
15
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.
93
Total Reports
28
Deaths Reported
30.1%
Death Rate

Active Ingredients

Lasix

Administration Routes

UnknownOralIntravenous

Species Affected

Dog 83
Cat 9
Human 1

Most Affected Breeds

Chihuahua 6
Shih Tzu 5
Crossbred Canine/dog 5
Schnauzer - Miniature 4
Dog (unknown) 4
Domestic Shorthair 3
Maltese 3
Retriever - Labrador 3
Domestic Mediumhair 3
Havanese 3

Most Reported Reactions

Death 15
Diarrhoea 13
Death by euthanasia 13
Seizure NOS 12
Vomiting 11
Lethargy (see also Central nervous system depression in Neurological) 9
Lethargy (see also Central nervous system depression in 'Neurological') 8
Abnormal radiograph finding 8
Weakness 8
Cough 7
Not eating 7
Anorexia 7

Outcome Breakdown

Ongoing
33 (35.5%)
Outcome Unknown
18 (19.4%)
Died
15 (16.1%)
Recovered/Normal
14 (15.1%)
Euthanized
13 (14.0%)

Lasix Adverse Event Insights

93 reports name Lasix; 28 recorded a death outcome (30.1% of reported events, not a population-level mortality rate). Active ingredient: Lasix. Administration routes: Unknown, Oral, Intravenous.

By species: Dog (83 reports), Cat (9 reports), Human (1 reports). By breed: Chihuahua (6), Shih Tzu (5), Crossbred Canine/dog (5).

Leading clinical signs: Death (15), Diarrhoea (13), Death by euthanasia (13), Seizure NOS (12). Outcome, 93 coded reports: Ongoing leads at 35.5%.

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.