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Interaction Between Traditional Chinese Medicine and Anticoagulant/antiplatelet Drugs.

BACKGROUND
Traditional Chinese Medicine (TCM) has been used for medical purposes since the ancient time and has gradually gained recognition worldwide. Nowadays, patients with thrombus presiding to anticoagulant/antiplatelet drugs prefer taking TCM. However, an increasing number of studies on herb-drug interactions have been shown. Nevertheless, findings are frequently conflicting and vague. In this review, we discuss the herb-drug interactions between TCM and anticoagulant/antiplatelet drugs to provide guidance on concomitant ingestion with anticoagulant/antiplatelet drugs.


METHODS
We undertook a structured search of medicine and drug databases for peer-reviewed literature using focused review questions.


RESULTS
Danshen, Ginkgo, Ginger, H. Perforatum, SMY and Puerarin injection had directional regulation effects on the efficacy of anticoagulant drugs by altering the CYPs, pharmacokinetic indexs and hemorheological parameters. H. Perforatum inhibited the efficacy of Clopidogrel by enhancing the CYP3A4 activity and Ginkgo increased the efficacy of Ticlopidine. Additionally, Renshen, the formulae except SMY and injections except Puerarin injection could increase or decrease the efficacy of anticoagulant/antiplatelet drugs via regulating the CYPs, platelet aggregation, hemorheological parameters and others.


CONCLUSION
Some cases have reported that TCMs may increase the bleeding risk or has no effect on coagulation when anticoagulant/antiplatelet drugs are concurrently used. However, pharmacokinetic studies have presented either consistent or slightly varying results. So it is difficult to ascertain whether the concurrent use of TCM may increase or reduce the pharmacologic effects of anticoagulant/antiplatelet drugs with adverse reactions. Therefore, herb-drug interactions of TCM and anticoagulant/antiplatelet drugs should be further explored and defined.