European Journal of Clinical Pharmacology

, Volume 64, Issue 5, pp 489–495

Interindividual variability of oral sumatriptan pharmacokinetics and of clinical response in migraine patients

  • Anna Ferrari
  • Diego Pinetti
  • Alfio Bertolini
  • Ciro Coccia
  • Emilio Sternieri
Pharmacokinetics and Disposition

Abstract

Background

The marketing of sumatriptan, a selective serotonin (5-HT) 1B/1D agonist, first of the class of triptans, has increased the therapeutic options for the treatment of migraine attacks. However, almost one third of patients in clinical trials fail to have headache relief after oral administration of sumatriptan.

Objective

To evaluate whether the interindividual differences in the clinical response following oral administration of sumatriptan are due to differences in its pharmacokinetics.

Methods

We compared the pharmacokinetics of sumatriptan after oral (100 mg) and subcutaneous (6 mg) administration in two age- and gender-matched groups: ten subjects (group A) with satisfactory response and ten (group B) with unsatisfactory response to oral sumatriptan. Patients were studied during headache-free intervals. Blood samples were taken serially from baseline to 360 min after oral administration and from baseline to 180 min after subcutaneous injection. Sumatriptan plasma concentrations were determined by high-performance liquid chromatography (HPLC) with an electrochemical detector.

Results

Following oral dosing, patients of group A absorbed sumatriptan significantly faster and achieved early plasma levels significantly higher than patients of group B. The systemic exposure to sumatriptan during the first 2 h, which are the most important for rapid onset of action and for antimigraine efficacy, was significantly greater in group A than in group B (P < 0.001, Student’s t test for independent data). On the other hand, after subcutaneous injection of sumatriptan, the profile of the curves was similar in all patients, and there were no differences in pharmacokinetics between group A and group B.

Conclusion

The slow rate and low extent of absorption of the drug during the first 2 h after dosing observed in patients of group B could explain their unsatisfactory response to oral sumatriptan.

Keywords

Sumatriptan Absorption Pharmacokinetics Variability Response 

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Anna Ferrari
    • 1
    • 2
  • Diego Pinetti
    • 1
  • Alfio Bertolini
    • 1
  • Ciro Coccia
    • 1
  • Emilio Sternieri
    • 1
  1. 1.Division of Toxicology and Clinical Pharmacology, Headache CentreUniversity Centre for Adaptive Disorders and Headache, Section Modena II, University of Modena and Reggio EmiliaModenaItaly
  2. 2.Division of Toxicology and Clinical Pharmacology, Headache CentreUniversity of Modena and Reggio EmiliaModenaItaly

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