Drug profile

The FDA adverse-event record for Miralax

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

64
adverse-event reports
10.9%
death-coded share
Cat
most-reported species
9
Vomiting - 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.
64
Total Reports
7
Deaths Reported
10.9%
Death Rate

Active Ingredients

Miralax

Administration Routes

UnknownOralSubcutaneous

Species Affected

Cat 63
Dog 1

Most Affected Breeds

Domestic Shorthair 48
Domestic Longhair 5
Cat (other) 3
Ragdoll 1
Rex - Cornish 1
Scottish Fold Longhair 1
Domestic Mediumhair 1
Maine Coon 1
Abyssinian cat 1
Persian 1

Most Reported Reactions

Vomiting 9
Ataxia 8
Weight loss 8
Constipation 7
Lethargy (see also Central nervous system depression in Neurological) 7
Death by euthanasia 5
Abnormal radiograph finding 5
Skin scab 5
Not eating 4
Dilated pupils 4
Decreased appetite 4
Scratching 4

Outcome Breakdown

Ongoing
43 (67.2%)
Recovered/Normal
8 (12.5%)
Outcome Unknown
6 (9.4%)
Euthanized
5 (7.8%)
Died
2 (3.1%)

Miralax Adverse Event Insights

64 reports name Miralax; 7 recorded a death outcome (10.9% of reported events, not a population-level mortality rate). Active ingredient: Miralax. Administration routes: Unknown, Oral, Subcutaneous.

By species: Cat (63 reports), Dog (1 reports). By breed: Domestic Shorthair (48), Domestic Longhair (5), Cat (other) (3).

Leading clinical signs: Vomiting (9), Ataxia (8), Weight loss (8), Constipation (7). Outcome, 64 coded reports: Ongoing leads at 67.2%.

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.