Pharmacokinetic and pharmacodynamic profiles of vapiprost, a selective, long-lasting thromboxane receptor antagonist, after single and multiple oral administration to healthy volunteers.

Abstract:

:A selective thromboxane A2 (TXA2) receptor blocking agent, vapiprost, was orally administered to healthy male Japanese volunteers to investigate the pharmacokinetic and pharmacodynamic properties. The time-profile of vapiprost concentration in plasma was determined and the effects of the drug on platelet aggregation in platelet-rich plasma (PRP) induced by a stable TXA2 receptor agonist U-46619, adenosine diphosphate (ADP) and collagen, and platelet aggregation in whole blood induced by U-46619 ex vivo were simultaneously examined and compared. In the single-dose study (5, 10, and 20 mg/man) the plasma concentrations of the drug were fitted well to a one-compartment open model with a first-order absorption. The area under plasma concentration-time curve (AUC) and maximum plasma concentration (Cmax) showed dose-related increases, whereas the mean elimination half-lives (t1/2) remained approximately constant within the range of 0.99-1.1 hour. The drug was hardly recovered unchanged in urine. The platelet aggregation in PRP induced by collagen or U-46619 and the secondary aggregation by ADP were inhibited; that induced by U-46619 was the most specifically and completely inhibited at 2 hours after administration of any dose. The duration for maintaining the significant inhibition tended to depend on the dose and ranged from 24 to 36 hours after administration, which was much longer than expected from the plasma concentration of drug. The time-profile of inhibiting whole blood platelet aggregation that was induced by U-46619 was almost parallel to that of platelet aggregation in PRP by the same aggregant. The bleeding time was slightly prolonged 2 and 8 hours after administrations of 10 and 20 mg, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

J Clin Pharmacol

authors

Uematsu T,Nagashima S,Mizuno A,Hirano K,Nakashima M

doi

10.1002/j.1552-4604.1991.tb01917.x

subject

Has Abstract

pub_date

1991-09-01 00:00:00

pages

815-22

issue

9

eissn

0091-2700

issn

1552-4604

journal_volume

31

pub_type

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