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(S)-(-)-Acenocoumarol SONSTIGE INFOS: Acenocoumarol is a short-lived oral anti-coagulant, which, like warfarin, functions by inhibiting vitamin K epoxide reductase. It has higher intrinsic anticoagulant potency than warfarin and phenprocoumon, when evaluated in vitro. Acenocoumarol has a single chiral center that gives rise to two different enantiomeric forms. (S)-(-)-Acenocoumarol has a shorter plasma elimination half-life (1.8 hours) and faster plasma clearance (28.5 L/hour), compared to the (R)-()-enantiomer (6.6 hours, 1.9 L/hour). The S-enantiomer undergoes extensive first-pass metabolism during absorption from the gastrointestinal tract, whereas (R)- ()-acenocoumarol is rapidly absorbed and provides essentially complete oral bioavailability. Perhaps related to these pharmacokinetic characteristics, (S)-(-)- acenocoumarol is less potent in vivo as an anti-coagulant than the (R)-()- enantiomer. As the clearance of acenocoumarol is ~20-fold faster than that for warfarin, the plasma concentrations of acenocoumarol are substantially lower than those for warfarin in patients receiving long- term treatment. Zeige mehr
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