Pharmacokinetics, pharmacodynamics, and safety of the 5-HT(1B/1D) agonist eletriptan following intravenous and oral administration

Four separate studies were conducted to examine the safety, tolerability, pharmacokinetics (PK), and pharmacodynamics (PD) of eletriptan, a 5-HT(1B/1D) receptor agonist being developed for the treatment of migraines, after oral and intravenous administration. Fifty-five males received oral (1.5-30 m...

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Bibliographic Details
Published in:Journal of clinical pharmacology 2002-05, Vol.42 (5), p.528
Main Authors: Milton, K Ashley, Scott, Nicholas R, Allen, Michael J, Abel, Samantha, Jenkins, Vivienne C, James, Gerry C, Rance, David J, Eve, Malcolm D
Format: Article
Language:English
Subjects:
Administration, Oral
Adolescent
Adult
Biological Availability
Blood Pressure - drug effects
Cross-Over Studies
Dose-Response Relationship, Drug
Half-Life
Humans
Indoles - administration & dosage
Indoles - adverse effects
Indoles - chemistry
Indoles - pharmacokinetics
Injections, Intravenous
Male
Molecular Structure
Pyrrolidines - administration & dosage
Pyrrolidines - adverse effects
Pyrrolidines - chemistry
Pyrrolidines - pharmacokinetics
Serotonin Receptor Agonists - administration & dosage
Serotonin Receptor Agonists - adverse effects
Serotonin Receptor Agonists - chemistry
Serotonin Receptor Agonists - pharmacokinetics
Single-Blind Method
Tissue Distribution
Tryptamines
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Summary:Four separate studies were conducted to examine the safety, tolerability, pharmacokinetics (PK), and pharmacodynamics (PD) of eletriptan, a 5-HT(1B/1D) receptor agonist being developed for the treatment of migraines, after oral and intravenous administration. Fifty-five males received oral (1.5-30 mg or 30-120 mg) or intravenous (1.67-50 microg/kg or 50-102 microg/kg) eletriptan in four double- and single-blind, placebo-controlled, ascending-dose crossover studies. The maximum plasma concentration (Cmax) and area under the concentration curve (AUC) appeared linear over all dose ranges, with an apparent terminal half-life of 4 to 5 hours. Clearance and volume of distribution remained constant with dose. The time to first occurrence of Cmax (tmax) for oral eletriptan was approximately 1 hour and was unaffected by dose. Comparison of AUC values suggested an absolute bioavailability of approximately 50%. A linear PK/PD model, fitted to the data, predicted small, transient elevations in diastolic blood pressure following eletriptan doses > or = 60 mg. These effects were considered unlikely to be clinically significant. Eletriptan was well tolerated, and treatment-related adverse events were mild to moderate and transient. These PK properties should result in eletriptan having a rapid onset and sustained duration of action in terms of migraine efficacy.
ISSN:0091-2700
1552-4604