País: Canadá
Idioma: inglés
Fuente: Health Canada
WARFARIN SODIUM
TARO PHARMACEUTICALS INC
B01AA03
WARFARIN
3MG
TABLET
WARFARIN SODIUM 3MG
ORAL
100/1000
Prescription
COUMARIN DERIVATIVES
Active ingredient group (AIG) number: 0104597007; AHFS:
APPROVED
2000-08-09
Product Monograph INCLUDING PATIENT MEDICATION INFORMATION Pr TARO-WARFARIN Warfarin Sodium Tablets, USP 1, 2, 2.5, 3, 4, 5, 6, 7.5, 10 mg Immediate Release Tablets ANTICOAGULANT Taro Pharmaceuticals Inc. Date of Revision: 130 East Drive November 02, 2018 Brampton, Ontario L6T 1C1 Control No.: 221013 2 PRODUCT MONOGRAPH Pr TARO-WARFARIN Warfarin Sodium Tablets, USP 1, 2, 2.5, 3, 4, 5, 6, 7.5, 10 mg Immediate Release Tablets ANTICOAGULANT ACTION AND CLINICAL PHARMACOLOGY Warfarin sodium and other coumarin anticoagulants act by inhibiting the synthesis of Vitamin K dependent clotting factors, which include Factors II, VII, IX and X, and the anticoagulant proteins C and S. Half-lives of these clotting factors are as follows: Factor II - 60 hours, VII - 4-6 hours, IX - 24 hours, and X - 48-72 hours. The half-lives of proteins C and S are approximately 8 hours and 30 hours, respectively. The resultant _in vivo_ effect is a sequential depression of Factors VII, IX, X and II. Vitamin K is an essential cofactor for the post ribosomal synthesis of the vitamin K dependent clotting factors. The vitamin promotes the biosynthesis of g-carboxyglutamic acid residues in the proteins which are essential for biological activity. Warfarin is thought to interfere with clotting factor synthesis by inhibition of the regeneration of vitamin K 1 epoxide. The degree of depression is dependent upon the dosage administered. Therapeutic doses of warfarin decrease the total amount of the active form of each vitamin K dependent clotting factor made by the liver by approximately 30% to 50%. An anticoagulation effect generally occurs within 24 hours after drug administration. However, peak anticoagulant effect may be delayed 72 to 96 hours. The duration of action of a single dose of racemic warfarin is 2 to 5 days. The effects of warfarin may become more pronounced as effects of daily maintenance doses overlap. Anticoagulants have no direct effect on an established thrombus, nor do they reverse ischemic tissue damage. However, once a thrombus h Leer el documento completo