Drug profile

The FDA adverse-event record for Frontline Plus For Dog

56 adverse-event reports submitted to the FDA Center for Veterinary Medicine reference Frontline Plus For Dog. See the species affected, top reactions, and outcomes below.

56
adverse-event reports
5.4%
death-coded share
Dog
most-reported species
22
Lethargy (see also Central nervous system depression in 'Neurological') - 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.
56
Total Reports
3
Deaths Reported
5.4%
Death Rate

Active Ingredients

Frontline Plus For Dog

Administration Routes

UnknownTopicalOral

Species Affected

Dog 55
Human 1

Most Affected Breeds

Retriever - Labrador 8
Dog (other) 6
Retriever - Golden 4
Terrier - Yorkshire 4
Dog (unknown) 2
Spaniel - Cocker American 2
Bichon Frise 2
Papillon - Spaniel - Continental Toy (with erect ears or with dropped ears (Phaléne)) 2
Sheepdog - Shetland 2
Boxer (German Boxer) 2

Most Reported Reactions

Lethargy (see also Central nervous system depression in 'Neurological') 22
Vomiting 13
Diarrhoea 7
Behavioural disorder NOS 6
Not eating 5
Itching 4
Anorexia 3
Application site erythema 3
Scratching 3
Not drinking 3
Tachycardia 2
Walking difficulty 2

Outcome Breakdown

Outcome Unknown
32 (55.2%)
Recovered/Normal
20 (34.5%)
Ongoing
3 (5.2%)
Died
2 (3.4%)
Euthanized
1 (1.7%)

Frontline Plus For Dog Adverse Event Insights

56 reports name Frontline Plus For Dog; 3 recorded a death outcome (5.4% of reported events, not a population-level mortality rate). Active ingredient: Frontline Plus For Dog. Administration routes: Unknown, Topical, Oral.

By species: Dog (55 reports), Human (1 reports). By breed: Retriever - Labrador (8), Dog (other) (6), Retriever - Golden (4).

Leading clinical signs: Lethargy (see also Central nervous system depression in 'Neurological') (22), Vomiting (13), Diarrhoea (7), Behavioural disorder NOS (6). Outcome, 58 coded reports: Outcome Unknown leads at 55.2%.

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.