What the label lists and what reports show
Magnesium oxide side effects
Magnesium oxide's FDA label lists its adverse reactions in its own words. FAERS holds 42,078 reports naming it through July 30, 2026; the reaction reported most often, leaving out the conditions it is used for, product-use terms and outcomes, is nausea (2,950 reports).
- No generic listed
- Over the counter
Check it at the source: the magnesium oxide FDA label on DailyMed (effective July 6, 2026); the FDA FAERS public dashboard.
What do FAERS reports show?
42,078 reports list magnesium oxide among the medicines taken, each a report of something that happened, not proof the medicine caused it; 6,552 are coded as a death and 20,897 as a hospital stay. Counts follow how widely a medicine is used and watched, and they are not a measure of how risky it is. Of the 21 reactions below, none is named by the same term (in US spelling) in the label's adverse reactions, warnings or patient leaflet; a reaction the label does not name may still be there under another word, and a report does not show that the medicine caused it.
Reports received each year
The 25 most reported reactions
Source: FDA Adverse Event Reporting System (FAERS) via openFDA, reports through July 30, 2026; reactions as MedDRA preferred terms
What next?
- Magnesium oxide: the full record
- label, generics, price, shortages, recalls
- Report a side effect to the FDA
- MedWatch
- Side effects hub
- the most reported medicines and reactions