Drug profile

The FDA adverse-event record for Magnesium

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

11
adverse-event reports
18.2%
death-coded share
Human
most-reported species
3
Diarrhoea - 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.
11
Total Reports
2
Deaths Reported
18.2%
Death Rate

Active Ingredients

Magnesium

Administration Routes

UnknownOralIntravenous

Species Affected

Human 4
Horse 2
Dog 2
Cat 1
Alpaca 1
Other 1

Most Affected Breeds

Unknown 5
Horse (unknown) 1
American Shorthair 1
Retriever - Labrador 1
Quarter Horse 1
Alpaca 1
Mastiff (unspecified) 1

Most Reported Reactions

Diarrhoea 3
Accidental exposure 3
Injection site inflammation 2
Seizure NOS 1
Collapse (see also 'Cardio-vascular' and 'Systemic disorders') 1
Sudden death 1
PR-LUNG(S), LESION(S) 1
Dyspnoea 1
Other abnormal test result NOS 1
Adrenal gland disorder NOS 1
Cushings disease - adrenal dependent 1
Spleen and reticulo-endothelial system disorder NOS 1

Outcome Breakdown

Recovered/Normal
4 (36.4%)
Ongoing
3 (27.3%)
Outcome Unknown
2 (18.2%)
Died
1 (9.1%)
Euthanized
1 (9.1%)

Magnesium Adverse Event Insights

11 reports name Magnesium; 2 recorded a death outcome (18.2% of reported events, not a population-level mortality rate). Active ingredient: Magnesium. Administration routes: Unknown, Oral, Intravenous.

By species: Human (4 reports), Horse (2 reports), Dog (2 reports). By breed: Unknown (5), Horse (unknown) (1), American Shorthair (1).

Leading clinical signs: Diarrhoea (3), Accidental exposure (3), Injection site inflammation (2), Seizure NOS (1). Outcome, 11 coded reports: Recovered/Normal leads at 36.4%.

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.