title: Alteration in nature of cluster headache during subcutaneous administration of sumatriptan.
abstract: OBJECTIVE
  To document the relationship between the 5-HT receptor agonist sumatriptan and a change in the nature of cluster headache in four cases. To relate the findings to the literature on the use of sumatriptan in both cluster headache and migraine.
  
  
  BACKGROUND
  Studies of the efficacy and adverse effects of long-term treatment with sumatriptan in cluster headache are limited and report conflicting findings.
  
  
  METHODS
  Four cases are described.
  
  
  RESULTS
  All four patients developed a marked increase in the frequency of attacks 3 to 4 weeks after initiating treatment with the drug for the first time. Three patients also developed a change in headache character, and 2 experienced prolongation of the cluster headache period. Withdrawal of the drug reduced the frequency of headaches and eliminated the newly developed type of headache.
  
  
  CONCLUSIONS
  Determination of the effects of long-term use of sumatriptan will result in more precise guidelines for the frequency and duration of treatment with this otherwise extremely beneficial drug.
authors.affiliation: Headache Unit, Department of Neurology, Meir General Hospital, Kfar Sava, and the Sackler Faculty of Medicine, Tel Aviv University, Israel.
authors.forename: R
authors.initials: R
authors.lastname: Hering-Hanit
mesh_terms: D000328:Adult; D002908:Chronic Disease; D003027:Cluster Headache / Q000139:chemically induced* / Q000150:complications / Q000188:drug therapy; D006261:Headache / Q000139:chemically induced; D006801:Humans; D007279:Injections, Subcutaneous; D008297:Male; D008875:Middle Aged; D012008:Recurrence; D017366:Serotonin Receptor Agonists / Q000009:adverse effects* / Q000627:therapeutic use; D018170:Sumatriptan / Q000009:adverse effects* / Q000627:therapeutic use; D013997:Time Factors
chemical_list: D017366:Serotonin Receptor Agonists; D018170:Sumatriptan