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Side effects may include bleeding, most commonly from the nose, gastrointestinal tract (GI) or genitourinary system. [2] Compared to the risk of bleeding with warfarin use, direct factor Xa inhibitors have a higher risk of GI bleeding, but lower risk of bleeding in the brain . [ 2 ]
Type A: augmented pharmacological effects, which are dose-dependent and predictable [5]; Type A reactions, which constitute approximately 80% of adverse drug reactions, are usually a consequence of the drug's primary pharmacological effect (e.g., bleeding when using the anticoagulant warfarin) or a low therapeutic index of the drug (e.g., nausea from digoxin), and they are therefore predictable.
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]
Warfarin [15] Papaya extract Carica papaya: Warfarin Damage to GI tract mucous membranes [3] Kava: kava-kava Piper methysticum: Sedatives, sleeping pills, antipsychotics, alcohol [15] Milkvetch: Astragalus: Astragalus may interact with medications that suppress the immune system, such as cyclophosphamide. [24] It may also affect blood sugar ...
Some such interactions are clinically significant, [19] although most herbal remedies are not associated with drug interactions causing serious consequences. [20] Most catalogued herb-drug interactions are moderate in severity. [21] The most commonly implicated conventional drugs in herb-drug interactions are warfarin, insulin, aspirin, digoxin ...
They are categorised as "first-generation" anticoagulants, and have similar effects as warfarin. They have been largely superseded by second-generation anticoagulants because warfarin-resistant rodents have become more common. [6] Anisindione, fluindione, and phenindione are oral anticoagulant medicines with actions similar to warfarin. However ...
Warfarin necrosis is a rare but severe complication of treatment with warfarin or related anticoagulants. [2] The typical patient appears to be an obese, middle aged woman (median age 54 years, male to female ratio 1:3). [1] [3]: 122–3 This drug eruption usually occurs between the third and tenth days of therapy with warfarin derivatives. [1]
Phenytoin, a CYP2C9 inducer, would increase its activity and the rate of warfarin breakdown, thereby reducing its efficacy. [25] Patients should avoid the co-administration of warfarin and phenytoin. In cases where both drugs must be used together, warfarin dosing may be titrated up to cope with the reduced efficacy. [26]