Pharmacokinetic, pharmacodynamic and pharmacogenetic profile of the oral antiplatelet agent ticagrelor.

Abstract:

:Acute coronary syndromes (ACS) remain life-threatening disorders associated with high morbidity and mortality, despite advances in treatment over the last decade. Adenosine diphosphate-induced platelet activation via P2Y(12) receptors plays a pivotal role in the pathophysiology of ACS. The current standard of treatment involves dual antiplatelet therapy with aspirin (acetylsalicylic acid) and the thienopyridine clopidogrel. Numerous studies and wide use in clinical practice have established the value of this approach in the treatment of ACS. However, clopidogrel treatment has a number of limitations, including a delayed onset of action due to the need for metabolic activation, variable and reduced antiplatelet effects in patients with certain genotypes, and prolonged recovery of platelet function due to irreversible P2Y(12) receptor binding. Prasugrel, a new thienopyridine, has demonstrated more consistent inhibition of platelet aggregation (IPA) than clopidogrel, although this thienopyridine also requires metabolic activation and treatment is associated with a significantly increased risk of life-threatening and fatal bleeding. The recently approved oral antiplatelet agent ticagrelor has the potential to overcome some of the limitations of current therapy due to its unique pharmacokinetic and pharmacodynamic profiles. It is a member of a new chemical class, the cyclopentyltriazolopyrimidines, and is a potent P2Y(12) receptor antagonist. Ticagrelor is rapidly absorbed, with a median time to maximum concentration of 1.3-2.0 hours. Ticagrelor does not require metabolic activation to an active form and binds rapidly and reversibly to the P2Y(12) receptor. As well as exerting effects via platelet P2Y(12) receptors, ticagrelor may confer additional benefits via inhibition of non-platelet P2Y(12) receptors. The pharmacokinetic profile of ticagrelor is not significantly affected by age, gender or administration with food, nor by prior treatment with, or responsiveness to, clopidogrel. Ticagrelor is primarily metabolized via the cytochrome P450 (CYP) 3A4 enzyme, rapidly produces plasma concentration-dependent IPA that is greater and more consistent than that observed with clopidogrel, and can also enhance platelet inhibition and overcome non-responsiveness in patients previously treated with clopidogrel. Importantly, the pharmacodynamic characteristics of ticagrelor are not influenced by CYP2C19 and ABCB1 genotypes. This article summarizes our current knowledge regarding the pharmacokinetic, pharmacodynamic and pharmacogenetic profile of ticagrelor.

journal_name

Clin Pharmacokinet

authors

Teng R

doi

10.2165/11630960-000000000-00000

subject

Has Abstract

pub_date

2012-05-01 00:00:00

pages

305-18

issue

5

eissn

0312-5963

issn

1179-1926

pii

1

journal_volume

51

pub_type

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