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Magnesium Sulfate side effects: what 12,964 FDA adverse event reports show

Magnesium Sulfate · 1,159 reaction terms · 62,637 drug–reaction co-reports · data 2026-09-14
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Drug class

Not stated in label

Who reports

12,964 reports · 90% serious · 2,099 with death outcome · 60% female

openFDA FAERS counts, all years, deduplication not applied

Used for

Magnesium Sulfate in 5% Dextrose Injection, USP is indicated for: • Prevention of eclampsia in patients with preeclampsia • Treatment of seizures and prevention of recurrent seizures in patients with eclampsia Magnesium Sulfate in 5% Dextrose Injection.

FDA label, Indications and Usage

What it is

Magnesium Sulfate in 5% Dextrose Injection, USP is a sterile, nonpyrogenic solution of magnesium sulfate heptahydrate and dextrose in water for injection for intravenous use. Each 100 mL conta.

FDA label, Description section

Boxed warning

None in the current label

How to read this page. FAERS is a spontaneous-reporting system: counts are not incidence rates and a signal is not proof of causation. Each reaction below is run through an automated screen — is the term in the FDA label (known), in the indications (the disease being treated), an administrative/coding term, or none of these (unlabeled)? That screen is mechanical text matching, not a causality assessment. The 30 hand-written Bradford Hill assessments are on the causality assessment page. Not medical advice.

Causality screen of the 40 strongest signals

Labeled (related wording) 2Likely indication confounding 2Reporting / coding artifact 1Lab value / disease marker 5Not in label — unassessed 30
What the badges mean

Strongest disproportionality signals

Flagged terms (PRR ≥ 2, χ² ≥ 4, n ≥ 10), ranked by PRR; infinite PRRs (no comparator reports) excluded. The EBGM column is a second, shrinkage-based estimate (MGPS) with its 5th percentile EB05 and the BCPNN IC025; a pair flagged by PRR alone is marked PRR-only and should be read as fragile. The strata column recomputes the PRR on serious reports only and flags pairs whose reports are unusually skewed by sex or come mostly from consumers rather than clinicians. 1,119 further terms are in the interactive explorer. Reaction links open the term's cross-drug page.

Show:
ReactionReportsPRR 95% CI · ROR · χ²/pEBGM EB05 · IC025Label screenSerious-only & strataTrial cross-check
Normal labour1075,330.1
3,592.5–7,908.3ROR 5,374.5 · χ² 130,025 / p <1e-300
1,005.2 EB05 855.2 · IC025 +7.2
3/3 methods agree
Not in label — unassessedserious n=107 · ♀ 100% (drug 60%)not reported in cached trials
Vaginal flatulence1531,636.9
1,307.1–2,049.7ROR 1,656.4 · χ² 122,605 / p <1e-300
733.4 EB05 640.9 · IC025 +7.5
3/3 methods agree
Not in label — unassessedserious n=153 · ♀ 100% (drug 60%)not reported in cached trials
Mitochondrial dna mutation30869.5
557.5–1,356.2ROR 871.5 · χ² 16,282 / p <1e-300
413.9 EB05 303.9 · IC025 +5.2
3/3 methods agree
Not in label — unassessedserious n=30 · ♀ 100% (drug 60%)not reported in cached trials
Neonatal intestinal perforation12797.0
398.7–1,593.4ROR 797.8 · χ² 5,840 / p <1e-300
287.9 EB05 175.5 · IC025 +3.6
3/3 methods agree
Not in label — unassessedserious n=12not reported in cached trials
Csf oligoclonal band present20315.7
195.4–509.8ROR 316.1 · χ² 4,977 / p <1e-300
210.8 EB05 144.1 · IC025 +4.4
3/3 methods agree
Lab value / disease markerserious n=20 · 90% cliniciannot reported in cached trials
Delivery108315.3
256.7–387.3ROR 317.9 · χ² 27,989 / p <1e-300
251.7 EB05 214.3 · IC025 +6.6
3/3 methods agree
Not in label — unassessedserious n=107 · ♀ 100% (drug 60%)not reported in cached trials
Hypermagnesaemia91267.6
214.5–334.0ROR 269.5 · χ² 20,471 / p <1e-300
218.8 EB05 183.6 · IC025 +6.3
3/3 methods agree
Not in label — unassessedserious n=87 · ♀ 90% (drug 60%) · 100% cliniciannot reported in cached trials
Burkholderia test positive16238.4
141.0–403.0ROR 238.7 · χ² 3,087 / p <1e-300
166.6 EB05 108.7 · IC025 +4.0
3/3 methods agree
Lab value / disease markerserious n=10not reported in cached trials
Negative pressure pulmonary oedema11216.5
115.3–406.3ROR 216.7 · χ² 1,892 / p <1e-300
143.7 EB05 85.7 · IC025 +3.3
3/3 methods agree
Not in label — unassessedserious n=11not reported in cached trials
Female genital tract fistula162168.0
143.0–197.4ROR 170.1 · χ² 24,182 / p <1e-300
149.4 EB05 131.1 · IC025 +6.4
3/3 methods agree
Not in label — unassessedserious n=162 · ♀ 100% (drug 60%)not reported in cached trials
Airway peak pressure increased13151.3
85.7–267.1ROR 151.4 · χ² 1,638 / p <1e-300
115.3 EB05 71.7 · IC025 +3.6
3/3 methods agree
Lab value / disease markerserious n=13not reported in cached trials
Pco2 increased50121.1
90.9–161.4ROR 121.6 · χ² 5,425 / p <1e-300
108.1 EB05 85.2 · IC025 +5.3
3/3 methods agree
Not in label — unassessedserious n=50 · ♀ 100% (drug 60%)not reported in cached trials
Neuromuscular blockade15113.9
67.5–192.2ROR 114.0 · χ² 1,463 / p <1e-300
94.0 EB05 60.4 · IC025 +3.7
3/3 methods agree
Not in label — unassessedserious n=13not reported in cached trials
Radiculopathy164107.2
91.6–125.4ROR 108.5 · χ² 16,068 / p <1e-300
99.4 EB05 87.2 · IC025 +6.0
3/3 methods agree
Not in label — unassessedserious n=164 · ♀ 97% (drug 60%)not reported in cached trials
Renal ischaemia32101.2
70.8–144.6ROR 101.5 · χ² 2,892 / p <1e-300
90.2 EB05 66.9 · IC025 +4.7
3/3 methods agree
Not in label — unassessedserious n=32 · ♀ 100% (drug 60%)not reported in cached trials
Po2 increased30100.7
69.6–145.5ROR 100.9 · χ² 2,692 / p <1e-300
89.5 EB05 65.7 · IC025 +4.6
3/3 methods agree
Not in label — unassessedserious n=30 · ♀ 100% (drug 60%)not reported in cached trials
Tachycardia foetal2896.8
66.1–141.7ROR 97.0 · χ² 2,414 / p <1e-300
86.1 EB05 62.5 · IC025 +4.5
3/3 methods agree
Not in label — unassessedserious n=27 · ♀ 0% (drug 60%) · 100% cliniciannot reported in cached trials
Chronic sinusitis20593.6
81.3–107.6ROR 95.0 · χ² 17,646 / p <1e-300
87.7 EB05 78.1 · IC025 +6.0
3/3 methods agree
Not in label — unassessedserious n=206 · ♀ 100% (drug 60%)not reported in cached trials
Proctitis15292.6
78.7–109.0ROR 93.7 · χ² 12,935 / p <1e-300
86.7 EB05 75.7 · IC025 +5.8
3/3 methods agree
Not in label — unassessedserious n=152 · ♀ 100% (drug 60%)not reported in cached trials
Propofol infusion syndrome3891.9
66.3–127.4ROR 92.2 · χ² 3,146 / p <1e-300
83.4 EB05 63.5 · IC025 +4.8
3/3 methods agree
Not in label — unassessedserious n=38 · ♀ 100% (drug 60%)not reported in cached trials
Adrenal suppression4591.0
67.4–122.9ROR 91.3 · χ² 3,706 / p <1e-300
83.2 EB05 64.7 · IC025 +5.0
3/3 methods agree
Not in label — unassessedserious n=45 · ♀ 0% (drug 60%)not reported in cached trials
Blood magnesium increased4890.7
67.8–121.2ROR 91.0 · χ² 3,943 / p <1e-300
83.1 EB05 65.2 · IC025 +5.0
3/3 methods agree
Likely indication confounding
term in indications; also in warnings
serious n=30 · ♀ 100% (drug 60%) · 100% cliniciannot reported in cached trials
Blood gases abnormal2682.6
55.7–122.4ROR 82.7 · χ² 1,915 / p <1e-300
74.4 EB05 53.4 · IC025 +4.3
3/3 methods agree
Lab value / disease markerserious n=26 · ♀ 100% (drug 60%)not reported in cached trials
Apgar score low5673.1
56.0–95.5ROR 73.4 · χ² 3,740 / p <1e-300
68.4 EB05 54.6 · IC025 +5.0
3/3 methods agree
Not in label — unassessedserious n=54 · 100% cliniciannot reported in cached trials
Status asthmaticus1966.9
42.3–105.8ROR 67.0 · χ² 1,121 / p 5e-246
60.5 EB05 40.9 · IC025 +3.8
3/3 methods agree
Not in label — unassessedserious n=19not reported in cached trials
Macular degeneration46365.3
59.6–71.6ROR 67.7 · χ² 28,127 / p <1e-300
62.6 EB05 58.0 · IC025 +5.7
3/3 methods agree
Not in label — unassessedserious PRR 43.2 · ♀ 100% (drug 60%)not reported in cached trials
Respiratory tract infection bacterial1963.8
40.3–100.8ROR 63.9 · χ² 1,069 / p 9e-235
58.0 EB05 39.2 · IC025 +3.8
3/3 methods agree
Not in label — unassessedserious n=19not reported in cached trials
Hellp syndrome2362.5
41.2–94.7ROR 62.6 · χ² 1,280 / p 1e-280
57.4 EB05 40.3 · IC025 +4.0
3/3 methods agree
Not in label — unassessedserious n=23 · ♀ 100% (drug 60%) · 100% cliniciannot reported in cached trials
Pleocytosis2057.8
37.0–90.2ROR 57.8 · χ² 1,022 / p 1e-224
53.1 EB05 36.3 · IC025 +3.8
3/3 methods agree
Not in label — unassessedserious n=20not reported in cached trials
Blood ph decreased5755.4
42.5–72.1ROR 55.6 · χ² 2,889 / p <1e-300
52.7 EB05 42.1 · IC025 +4.8
3/3 methods agree
Lab value / disease markerserious n=57 · ♀ 100% (drug 60%)not reported in cached trials
Eclampsia1255.1
31.0–98.0ROR 55.2 · χ² 565 / p 3e-125
49.4 EB05 30.1 · IC025 +3.1
3/3 methods agree
Likely indication confounding
term in indications; also in warnings
serious n=12not reported in cached trials
Intraventricular haemorrhage neonatal1654.7
33.3–90.1ROR 54.8 · χ² 765 / p 1e-168
50.0 EB05 32.6 · IC025 +3.5
3/3 methods agree
Not in label — unassessedserious n=16not reported in cached trials
Diabetes insipidus7954.5
43.6–68.1ROR 54.8 · χ² 3,960 / p <1e-300
52.1 EB05 43.1 · IC025 +4.9
3/3 methods agree
Not in label — unassessedserious n=79not reported in cached trials
Neonatal infection1153.0
29.1–96.6ROR 53.0 · χ² 494 / p 1e-109
47.4 EB05 28.2 · IC025 +3.0
3/3 methods agree
Not in label — unassessedserious n=11not reported in cached trials
Low birth weight baby24952.3
46.1–59.2ROR 53.3 · χ² 12,077 / p <1e-300
50.4 EB05 45.4 · IC025 +5.3
3/3 methods agree
Not in label — unassessedserious PRR 32.7 · 98% cliniciannot reported in cached trials
Maternal exposure during delivery3051.5
35.8–74.0ROR 51.6 · χ² 1,390 / p <1e-300
48.5 EB05 35.6 · IC025 +4.2
3/3 methods agree
Reporting / coding artifactserious n=25 · ♀ 100% (drug 60%) · 100% cliniciannot reported in cached trials
Postpartum haemorrhage3848.2
34.9–66.5ROR 48.3 · χ² 1,659 / p <1e-300
45.8 EB05 34.8 · IC025 +4.3
3/3 methods agree
Not in label — unassessedserious n=38 · ♀ 100% (drug 60%) · 100% cliniciannot reported in cached trials
Foetal heart rate deceleration abnormality2047.3
30.3–73.8ROR 47.4 · χ² 836 / p 4e-184
44.2 EB05 30.2 · IC025 +3.7
3/3 methods agree
Not in label — unassessedserious n=20not reported in cached trials

Trial evidence (ClinicalTrials.gov)

✓ Trial adverse-event data found on ClinicalTrials.gov

Largest completed trials with posted results that list Magnesium Sulfate as a study intervention. The right-hand column of the signal table shows whether each FAERS term was also recorded in these trials, with a real denominator (0 of 40 signal terms matched).

Caveats: trial populations, doses and follow-up differ from the reporting population; AE terms are sponsor-coded and matched here by wording; absence from a trial list means the term was not reported above the sponsor's frequency threshold, not that it cannot occur.

Most frequently reported reactions

By raw co-report count, regardless of disproportionality. Common terms here are often the illness itself or generic outcomes.

ReactionReportsPRR 95% CI · ROR · χ²/pEBGM EB05 · IC025Label screenSerious-only & strataTrial cross-check
Drug ineffective (drug did not work)1,2261.5
1.4–1.6ROR 1.6 · χ² 221 / p 2e-50
1.5 EB05 1.4 · IC025 +0.5Reporting / coding artifactserious PRR 2.5not reported in cached trials
Off label use (used outside approved label)8491.6
1.5–1.7ROR 1.6 · χ² 189 / p 3e-43
1.6 EB05 1.5 · IC025 +0.5Reporting / coding artifactserious PRR 1.7not reported in cached trials
Nausea8461.7
1.6–1.9ROR 1.8 · χ² 272 / p 2e-61
1.7 EB05 1.6 · IC025 +0.7Not in label — unassessedserious PRR 2.0NCT01099449: 3/117 (2.6%) on Magnesium Sulfate; 3/116 (2.6%) control (serious AE)
Pyrexia (fever)7953.7
3.5–4.0ROR 3.9 · χ² 1,600 / p <1e-300
3.7 EB05 3.5 · IC025 +1.8
3/3 methods agree
Not in label — unassessedserious PRR 2.9NCT00059332: 2/857 (0.2%) on Magnesium Sulfate (serious AE)
Maternal exposure during pregnancy75714.0
13.0–15.0ROR 14.8 · χ² 9,073 / p <1e-300
13.9 EB05 13.1 · IC025 +3.7
3/3 methods agree
Reporting / coding artifactserious PRR 10.4 · ♀ 97% (drug 60%) · 94% cliniciannot reported in cached trials
Pain7161.9
1.8–2.0ROR 1.9 · χ² 304 / p 3e-68
1.9 EB05 1.8 · IC025 +0.8Not in label — unassessedserious PRR 1.8NCT00059332: 1/857 (0.1%) on Magnesium Sulfate (serious AE)
Foetal exposure during pregnancy68413.7
12.7–14.8ROR 14.4 · χ² 8,013 / p <1e-300
13.6 EB05 12.8 · IC025 +3.6
3/3 methods agree
Reporting / coding artifactserious PRR 8.8 · 96% cliniciannot reported in cached trials
Premature baby67236.8
34.1–39.6ROR 38.7 · χ² 22,861 / p <1e-300
35.9 EB05 33.7 · IC025 +5.0
3/3 methods agree
Not in label — unassessedserious PRR 23.1 · 96% cliniciannot reported in cached trials
Diarrhoea (diarrhea)6581.7
1.5–1.8ROR 1.7 · χ² 175 / p 3e-40
1.7 EB05 1.5 · IC025 +0.6Not in label — unassessedserious PRR 1.7NCT00059332: 1/857 (0.1%) on Magnesium Sulfate (serious AE)
Dyspnoea (shortness of breath)6101.7
1.6–1.9ROR 1.8 · χ² 198 / p 3e-45
1.7 EB05 1.6 · IC025 +0.7Not in label — unassessedserious PRR 1.4NCT00059332: 34/857 (4.0%) on Magnesium Sulfate (serious AE)
Hypotension (low blood pressure)5614.5
4.2–4.9ROR 4.7 · χ² 1,554 / p <1e-300
4.5 EB05 4.2 · IC025 +2.0
3/3 methods agree
Labeled adverse reaction
exact term
serious PRR 3.3NCT00059332: 59/857 (6.9%) on Magnesium Sulfate (serious AE)
Anaemia (low red blood cells)5594.7
4.4–5.1ROR 4.9 · χ² 1,659 / p <1e-300
4.7 EB05 4.4 · IC025 +2.1
3/3 methods agree
Not in label — unassessedserious PRR 3.3NCT00059332: 12/857 (1.4%) on Magnesium Sulfate (serious AE)
Vomiting5301.8
1.7–2.0ROR 1.9 · χ² 202 / p 3e-46
1.8 EB05 1.7 · IC025 +0.7Not in label — unassessedserious PRR 1.7NCT00059332: 1/857 (0.1%) on Magnesium Sulfate (serious AE)
Pneumonia (lung infection)4902.5
2.2–2.7ROR 2.5 · χ² 426 / p 6e-95
2.4 EB05 2.3 · IC025 +1.1
3/3 methods agree
Not in label — unassessedserious PRR 1.6NCT00059332: 36/857 (4.2%) on Magnesium Sulfate (serious AE)

Unlabeled candidate signals

These flagged terms were not found in the FDA label text and do not match an artifact pattern. They are the pairs that would merit a structured assessment (temporality, dose-response, biological plausibility, consistency across databases, trial or cohort evidence). The screen has not done that; string-matching misses label wording, and a strong PRR can still be stimulated reporting, co-medication, or the disease itself.

Want to assess one of these properly? The runbook describes the Bradford Hill / trial-evidence workflow used on the assessment page, and handoff_top1000_signals.csv lists the strongest unassessed pairs across all drugs.

Common questions

What are the most reported side effects of Magnesium Sulfate?

In FDA FAERS, the most frequently co-reported reaction terms for Magnesium Sulfate are nausea, pyrexia, pain, premature baby, diarrhoea, dyspnoea. These are report counts, not rates: FAERS has no denominator, reporting is voluntary and uneven, and a term can be reported because of the illness being treated rather than the drug.

Does Magnesium Sulfate have an FDA boxed warning?

No. The FDA label retrieved for Magnesium Sulfate has no boxed warning; see the label's Warnings and Precautions for the recognised risks.

Do FAERS signals prove that Magnesium Sulfate causes these side effects?

No. A disproportionality signal (PRR, ROR) means a reaction is reported more often with this drug than with others in the database. That can reflect a real effect, but also the disease being treated, stimulated reporting after news or litigation, co-medications, or how reports are coded. Causality needs temporality, dose-response, biological plausibility, consistency across data sources and, ideally, trial or cohort evidence. This page screens each term against the FDA label and ClinicalTrials.gov results; it does not establish causation.

Sources & methods

Page generated 2026-10-08. Label and PubChem text are retrieved automatically and may lag the current label; always check the current prescribing information. OpenPV is a beta research tool of the Open Source Medicine Foundation.