Drug profile

The FDA adverse-event record for Praziquantel + Pyrantel

679 adverse-event reports submitted to the FDA Center for Veterinary Medicine reference Praziquantel + Pyrantel. See the species affected, top reactions, and outcomes below.

679
adverse-event reports
5.4%
death-coded share
Cat
most-reported species
191
Ataxia - 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.
679
Total Reports
37
Deaths Reported
5.4%
Death Rate

Active Ingredients

PraziquantelPraziquantel + PyrantelPyrantel

Administration Routes

OralUnknownTopical

Species Affected

Cat 636
Dog 22
Unknown 19
Human 2

Most Affected Breeds

Domestic Shorthair 399
Cat (unknown) 85
Domestic Longhair 48
Domestic Mediumhair 47
Unknown 23
Siamese 13
Himalayan 7
Russian 6
Maine Coon 6
Persian 5

Most Reported Reactions

Ataxia 191
Vomiting 170
Lethargy (see also Central nervous system depression in 'Neurological') 90
Anorexia 48
Behavioural disorder NOS 46
Emesis 44
Lack of efficacy (endoparasite) - tapeworm 44
Hypersalivation 40
Diarrhoea 39
Emesis (multiple) 29
Pruritus 25
Overdose 22

Outcome Breakdown

Recovered/Normal
366 (55.5%)
Outcome Unknown
245 (37.1%)
Died
22 (3.3%)
Euthanized
15 (2.3%)
Ongoing
12 (1.8%)

Praziquantel + Pyrantel Adverse Event Insights

679 reports name Praziquantel + Pyrantel; 37 recorded a death outcome (5.4% of reported events, not a population-level mortality rate). Active ingredients: Praziquantel, Praziquantel + Pyrantel, Pyrantel. Administration routes: Oral, Unknown, Topical.

By species: Cat (636 reports), Dog (22 reports), Unknown (19 reports). By breed: Domestic Shorthair (399), Cat (unknown) (85), Domestic Longhair (48).

Leading clinical signs: Ataxia (191), Vomiting (170), Lethargy (see also Central nervous system depression in 'Neurological') (90), Anorexia (48). Outcome, 660 coded reports: Recovered/Normal leads at 55.5%.

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.