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Warfarin interacts with many commonly used drugs, and the metabolism of warfarin varies greatly between patients. [27] Some foods have also been reported to interact with warfarin. [27] Apart from the metabolic interactions, highly protein bound drugs can displace warfarin from serum albumin and cause an increase in the INR. [63]
Direct factor Xa inhibitors can be considered as an alternative to warfarin, particularly if a person is on several other medications that interact with warfarin, or if attending medical appointments and laboratory monitoring becomes difficult. [8]
Warfarin (actually the S-warfarin enantiomer) is a specific probe for CYP2C9. The '+ 1' refers to the vitamin K that is given together with the warfarin to prevent any anticoagulant effect. The Cooperstown cocktail and the Cooperstown 5 + 1 cocktail are powerful tools for investigating the activity of important drug metabolising enzymes.
Ximelagatran (Exanta or Exarta, H 376/95) is an anticoagulant that has been investigated extensively as a replacement for warfarin [1] that would overcome the problematic dietary, drug interaction, and monitoring issues associated with warfarin therapy.
Ximelagatran showed good efficacy compared with warfarin in several trials in prevention and treatment of deep vein thrombosis and as thromboprophylaxis in atrial fibrillation. [1] Development was stopped by manufacturer AstraZeneca , however, because of reports of liver enzyme derangements and liver failure .
Quinine has diverse unwanted interactions with numerous prescription drugs, such as potentiating the anticoagulant effects of warfarin. [5] It is a strong inhibitor of CYP2D6, [38] an enzyme involved in the metabolism of many drugs.
Moclobemide is also likely to interact with warfarin. [75] The combination of moclobemide with prescription or over the counter sympathomimetic drugs is not recommended due to the potential of significant drug interactions. [76]
Dabigatran etexilate is rapidly absorbed, it lacks interaction with cytochrome P450 enzymes and with other food and drugs, there is no need for routine monitoring and it has a broad therapeutic index and a fixed-dose administration, which is excellent safety compared with warfarin. [4]