Drug profile

The FDA adverse-event record for Ivermectin + Praziquantel

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

460
adverse-event reports
3.7%
death-coded share
Horse
most-reported species
73
Swollen mouth - 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.
460
Total Reports
17
Deaths Reported
3.7%
Death Rate

Active Ingredients

IvermectinIvermectin + PraziquantelPraziquantel

Administration Routes

OralUnknown

Species Affected

Horse 365
Unknown 66
Dog 19
Donkey 5
Human 2
Cat 1
Rabbit 1
Llama 1

Most Affected Breeds

Quarter Horse 89
Unknown 72
Horse (unknown) 60
Thoroughbred 40
Horse (other) 40
Arab 18
Paint 17
Crossbred Equine/horse 14
Tennessee Walking Horse 13
Warmblood (unspecified) 8

Most Reported Reactions

Swollen mouth 73
Application site swelling 58
Oral swelling 55
Hypersalivation 53
Swollen lip (see also 'Skin') 45
Swollen tongue 44
Anorexia 33
Tongue protrusion 22
Drooling 21
Locking Mechanism Abnormal 19
Colic 18
Application site inflammation 17

Outcome Breakdown

Recovered/Normal
224 (55.7%)
Outcome Unknown
131 (32.6%)
Ongoing
29 (7.2%)
Died
12 (3.0%)
Euthanized
5 (1.2%)
Recovered with Sequela
1 (0.2%)

Ivermectin + Praziquantel Adverse Event Insights

460 reports name Ivermectin + Praziquantel; 17 recorded a death outcome (3.7% of reported events, not a population-level mortality rate). Active ingredients: Ivermectin, Ivermectin + Praziquantel, Praziquantel. Administration routes: Oral, Unknown.

By species: Horse (365 reports), Unknown (66 reports), Dog (19 reports). By breed: Quarter Horse (89), Unknown (72), Horse (unknown) (60).

Leading clinical signs: Swollen mouth (73), Application site swelling (58), Oral swelling (55), Hypersalivation (53). Outcome, 402 coded reports: Recovered/Normal leads at 55.7%.

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.