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Although clopidogrel had better activity/toxicity ratio than ticlopidine there were still problems with its activity as 30% of patients have clopidogrel resistance. The major factor in clopidogrel resistance is CYP2C19 polymorphism, which occurs in 30-55% patients.
Clopidogrel, sold under the brand name Plavix among others, is an antiplatelet medication used to reduce the risk of heart disease and stroke in those at high risk. [10] It is also used together with aspirin in heart attacks and following the placement of a coronary artery stent ( dual antiplatelet therapy ). [ 10 ]
Between 1998 and 2007, 33 serious adverse drug or device reactions have been reported by RADAR investigators. The toxicities involved multiple biological system and included thrombotic thrombocytopenic purpura (TTP) (ticlopidine and clopidogrel), thromboembolism (thalidomide and lenalidomide), liver failure (gemtuzumab and nevirapine), hypersensitivity (drug eluting coronary arterial stents ...
The prevalence of the CYP2C19*17 variant is less than 5% in Asian populations and is approximately four times higher in European and African populations. [26] The alleles CYP2C19*2 [34] and *3 may reduce the efficacy of clopidogrel (Plavix), an antiplatelet medication. The basis for this reduced effect of clopidogrel in patients who have a gene ...
When in comparison to clopidogrel, there is evidence for increased risk of bleeding. [38] The PLATO trial [39] found that ticagrelor use, in conjunction with low-dose aspirin (where tolerated), had better all-cause mortality rates than the same treatment plan with clopidogrel (4.5% vs. 5.9%) in treating people with acute coronary syndrome ...
5 Examples. 6 History. 7 Society and ... mask gastric cancers or other serious gastric problems. ... metabolism of the platelet inhibitor clopidogrel is known and ...
Clopidogrel, unlike prasugrel, was issued a black box warning from the FDA on 12 March 2010, as the estimated 2–14% of the US population who have low levels of the CYP2C19 liver enzyme needed to activate clopidogrel may not get the full effect. Tests are available to predict if a patient would be susceptible to this problem or not.
An antiplatelet drug (antiaggregant), also known as a platelet agglutination inhibitor or platelet aggregation inhibitor, is a member of a class of pharmaceuticals that decrease platelet aggregation [1] and inhibit thrombus formation.