title: Eletriptan for the acute treatment of migraine: results of bridging a Japanese study to Western clinical trials.
abstract: OBJECTIVE
  To compare the efficacy, safety and tolerability of eletriptan (20, 40 and 80 mg) to placebo when given to Japanese and Western patients for the acute treatment of migraine.
  
  
  METHODS
  A double-blind, randomized, parallel-group trial with the aforementioned therapeutic objectives was conducted in Japan (N = 321). By bridging analysis, data from this study were compared to two migraine trials previously conducted in the US (N = 1190) and Europe (N = 563).
  
  
  RESULTS
  The 2-h post-dose headache response rates (i.e., the primary efficacy endpoint) of Japanese migraineurs to eletriptan 20, 40 and 80 mg were 64, 67 and 76%, respectively; European and American migraineurs showed similar trends and, in these studies, eletriptan was significantly superior to placebo (p < 0.05). Japanese patients did demonstrate a higher placebo response than Westerners, possibly due to differences in previous triptan exposure or expectation. Adverse events were generally mild to moderate, were comparable in all three studies, and showed a modest dose-response effect.
  
  
  CONCLUSIONS
  The efficacy and tolerability of eletriptan for the acute treatment of migraine is comparable in Japan, Europe and the US.
authors.affiliation: Department of Medicine, Kitasato University Hospital, Sagamihara City, Kanagawa Prefecture, Japan. fsakai@kitasato-u.ac.jp
authors.forename: F
authors.initials: F
authors.lastname: Sakai
authors.forename: H-C
authors.initials: HC
authors.lastname: Diener
authors.forename: R
authors.initials: R
authors.lastname: Ryan
authors.forename: P
authors.initials: P
authors.lastname: Poole
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D018712:Analgesics, Non-Narcotic / Q000627:therapeutic use*; D001315:Australia; D002986:Clinical Trials as Topic; D004311:Double-Blind Method; D005060:Europe; D005260:Female; D006801:Humans; D007211:Indoles / Q000627:therapeutic use*; D007564:Japan; D008297:Male; D008875:Middle Aged; D008881:Migraine Disorders / Q000188:drug therapy*; D011759:Pyrrolidines / Q000627:therapeutic use*; D017366:Serotonin Receptor Agonists / Q000627:therapeutic use*; D016896:Treatment Outcome; D014363:Tryptamines; D014481:United States
chemical_list: D018712:Analgesics, Non-Narcotic; D007211:Indoles; D011759:Pyrrolidines; D017366:Serotonin Receptor Agonists; D014363:Tryptamines; C115647:eletriptan