title: Effects of Intravenous and Oral Magnesium on Reducing Migraine: A Meta-analysis of Randomized Controlled Trials.
abstract: BACKGROUND
  Migraine attack has been associated with magnesium deficiency. Previous studies investigating the effect of intravenous and oral magnesium on acute migraine attacks and the prevention of migraine have produced equivocal findings.
  
  
  OBJECTIVE
  To evaluate the effects of intravenous magnesium on acute migraine attacks and oral magnesium supplements on migraine prophylaxis.
  
  
  METHODS
  A meta-analysis of randomized controlled trials (RCTs). Electronic databases, namely EMBASE, PubMed, the Wanfang Data Chinese Database, and the China Knowledge Resource Integrated Database were searched from inception to February 24, 2015.
  
  
  METHODS
  This review was conducted according to the guidelines of the PRISMA. Only RCTs evaluating the effects of intravenous or oral magnesium on migraine compared with a control group were included.
  
  
  RESULTS
  A total of 21 studies were included. Of which, 11 studies investigated the effects of intravenous magnesium on acute migraine (948 participants) and 10 examined the effects of oral magnesium on migraine prophylaxis (789 participants). Intravenous magnesium significantly relieved acute migraine within 15 - 45 minutes, 120 minutes, and 24 hours after the initial infusion (Odd ratios [ORs] = 0.23, 0.20, and 0.25, respectively). Oral magnesium significantly alleviated the frequency and intensity of migraine (ORs = 0.20 and 0.27).
  
  
  CONCLUSIONS
  Some of the included studies did not adopt adequate randomization methods.
  
  
  CONCLUSIONS
  Intravenous magnesium reduces acute migraine attacks within 15 - 45 minutes, 120 minutes, and 24 hours after the initial infusion and oral magnesium alleviates the frequency and intensity of migraine. Intravenous and oral magnesium should be adapted as parts of multimodal approach to reduce migraine.
authors.affiliation: School of Nursing, College of Nursing, Taipei Medical University, Taipei, Taiwan.
authors.forename: Hsiao-Yean
authors.initials: HY
authors.lastname: Chiu
authors.affiliation: Department of Neurology, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan.
authors.forename: Tu-Hsueh
authors.initials: TH
authors.lastname: Yeh
authors.affiliation: Department of Neurosurgery, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan; College of Medicine, Chang Gung University, Taoyuan, Taiwan.
authors.forename: Yin-Cheng
authors.initials: YC
authors.lastname: Huang
authors.affiliation: Department of Neurosurgery, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan; College of Medicine, Chang Gung University, Taoyuan, Taiwan.
authors.forename: Pin-Yuan
authors.initials: PY
authors.lastname: Chen
mesh_terms: D061605:Administration, Intravenous; D000284:Administration, Oral; D006801:Humans; D008274:Magnesium / Q000008:administration & dosage*; D008881:Migraine Disorders / Q000175:diagnosis* / Q000188:drug therapy* / Q000453:epidemiology; D016032:Randomized Controlled Trials as Topic / Q000379:methods*; D016896:Treatment Outcome
chemical_list: D008274:Magnesium