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Pain & sedation
IV magnesium adds little for ED headache
Intravenous Magnesium Sulfate for Acute Nontraumatic Headache in the Emergency Department
Annals of Emergency Medicine · Added 25 August 2026
RCT of 1,028 ED patients with acute nontraumatic headache found IV magnesium sulfate plus paracetamol achieved more frequent treatment success (78.9% vs 65.1%) but pain score differences were below clinical importance thresholds, with less rescue analgesia needed but more mild side effects.
- Study type
- RCT
- Design
- Randomised double-blind placebo-controlled trial
- Participants
- 1,028 adults with acute nontraumatic headache
- Main finding
- MgSO4 plus paracetamol: treatment success 78.9% vs 65.1% (difference 13.8%, 95% CI 8–19), but pain score differences below 1.3-point clinical importance threshold; less rescue analgesia (7.1% vs 15.3%) and more adverse events (15.4% vs 11.1%)
- Caveat
- Benefits below accepted thresholds for clinical importance; ED-based, single-centre
- Bottom line
- Context only
Why it matters in Australia (Medium relevance). ED-based analgesia trial — magnesium showed statistical but not clinically meaningful benefit for prehospital use
Learning goal
Weigh the clinical importance of intravenous magnesium as adjunct analgesia for acute nontraumatic headache in my practice.
More
- Topic: Pain & sedation
- Daily scan: 25 August 2026
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