Drug profile

The FDA adverse-event record for Meclizine Hcl

12 FDA reports name Meclizine Hcl, a lower-volume drug in the CVM extract. Species, reactions, and outcomes follow.

#2369 of 2,679
by report volume (all drugs)
12
adverse-event reports
58.3%
death-coded share
Dog
most-reported species
Verify with FDA CVM →

Corpus placement

According to the FDA Center for Veterinary Medicine openFDA adverse-event extract, Meclizine Hcl ranks #2299 of 2679 by total reports (12). Death-coded-share rank requires at least 50 reports. National dual: Milbemycin Oxime + Spinosad is #1 of 2679 drugs by total adverse-event reports (149,624) at death-coded-share rank 965 of 1130 drugs with at least 50 reports (2.3%); separately, Atlantic Salmon Transgenic Whole (Opafp-Ghc2 Rdna Construct Inserted Into The A-Locus In The Eo-1A Lineage) is #1 highest death-coded share at 97.8% (report rank #821).

149,624
Milbemycin Oxime + Spinosad reports (#1)
97.8%
Atlantic Salmon Transgenic Whole (Opafp-Ghc2 Rdna Construct Inserted Into The A-Locus In The Eo-1A Lineage) death share (#1)
#2299
This drug, reports of 2679

Report volume reflects how common a breed or drug is and how often owners and vets file — not actual risk. Death-coded share ranks are limited to entries with enough reports to be meaningful. The two maps do not agree at #1.

Release-over-release change

What changed in the latest FDA data snapshot

PlainBreed reconstructed the prior snapshot from dated openFDA partitions through 2025 Q4, then compared it with the 2026-07-27 openFDA export. Meclizine Hcl has 12 reports now versus 12 in that prior snapshot: 0 the same number of (0.0%).

Report change
+0
Death-coded reports
+0
Death-coded share
+0.0 pts

This compares reported-event counts in two source snapshots. It does not establish a change in real-world risk, product safety, or disease incidence.

Subscribe to Meclizine Hcl changes

Signature read: Meclizine Hcl's 58.3% death-coded share is among the highest in the openFDA drug corpus.

Important: Adverse event reports do not establish that a drug caused or contributed to the event. Consult your veterinarian before making treatment decisions.
12
Total Reports
7
Deaths Reported
58.3%
Death-coded share of reports

Active Ingredients

Meclizine Hcl

Administration Routes

OralUnknownOther

Species Affected

Dog 12

Most Affected Breeds

Shepherd Dog - Australian 2
Retriever - Labrador 1
Sheepdog - Old English 1
Bulldog - French 1
Chihuahua 1
Mountain Dog - Bernese 1
Bulldog 1
Shepherd Dog - German 1
Pinscher - Miniature 1
Lhasa Apso 1

Most Reported Reactions

Death by euthanasia 6
Nystagmus 5
Ataxia 4
Vomiting 4
Other abnormal test result NOS 4
Seizure NOS 3
Drooling 3
Head tilt - neurological disorder 3
Decreased appetite 2
Lethargy (see also Central nervous system depression in 'Neurological') 2
Trembling 2
Vestibular disorder NOS 2

Outcome Breakdown

Euthanized
6 (50.0%)
Ongoing
3 (25.0%)
Recovered/Normal
2 (16.7%)
Died
1 (8.3%)

Meclizine Hcl: high death-coded share in the FDA AER row

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.

What to do with this drug

A report does not prove a drug caused the reaction; consult a veterinarian before acting on this data.

Source: FDA Center for Veterinary Medicine openFDA Animal & Veterinary Adverse Events (CVM AER) · 2025

openFDA Animal & Veterinary Adverse Events (FDA CVM) for Meclizine Hcl (#2369 of 2,679 by report volume); death-coded 58.3%. PlainBreed drug row · death-coded share stamp 58.3% · vintage 2025.

Informational only. FDA adverse-event reports are voluntary and do not prove causation; consult a veterinarian before acting on them. Verify with FDA CVM →