Once the maintenance dose is stabilised in the therapeutic range, it is rarely necessary to alter it. In emergencies, anticoagulant therapy should be initiated with heparin and warfarin together. Where there is less urgency, as in patients disposed to or at special risk of thromboembolism, anticoagulant therapy may be initiated with warfarin alone. Concomitant heparin therapy affects the results of control tests and should be discontinued at least six hours before the first test is carried out.
Control is established with INR monitoring at regular intervals and subsequent warfarin maintenance dosage further adjusted according to the results obtained. No data are available. Method of administration Warfarin Tablets are for oral use.
Patients should be given a patient-held information booklet 'warfarin card' and informed of symptoms for which they should seek medical attention. Commencement of therapy Monitoring When warfarin is started using a standard dosing regimen the INR should be determined daily or on alternate days in the early days of treatment.
INR should be monitored more frequently in patients at an increased risk of over coagulation e. Patients for whom adherence may be difficult should be monitored more frequently. Thrombophilia Patients with protein C deficiency are at risk of developing skin necrosis when starting warfarin treatment. In patients with protein C deficiency therapy should be introduced without a loading dose of warfarin even if heparin is given. Patients with protein S deficiency may also be at risk and it is advisable to introduce warfarin therapy slowly in these circumstances.
Risk of haemorrhage The most frequently reported adverse effect of all oral anticoagulants is haemorrhage. Warfarin should be given with caution to patients where there is a risk of serious haemorrhage e. All patients treated with warfarin should have INR monitored regularly. Those at high risk of bleeding may benefit from more frequent INR monitoring, careful dose adjustment to desired INR, and a shorter duration of therapy. Prophylaxis and treatment of venous thrombosis and its extension , pulmonary embolism PE.
Reduction in the risk of death, recurrent myocardial infarction MI , and thromboembolic events such as stroke or systemic embolization after myocardial infarction. Once a thrombus has occurred, however, the goals of anticoagulant treatment are to prevent further extension of the formed clot and to prevent secondary thromboembolic complications that may result in serious and possibly fatal sequelae.
Consult the latest evidence-based clinical practice guidelines regarding the duration and intensity of anticoagulation for the indicated conditions. NSAIDs including aspirin, other anticoagulants like heparin and dabigatran for treating thrombosis, antiplatelet drugs like eptifibatide and clopidogrel for preventing heart attack, streptokinase treating for heart attack Sulfinpyrazone for gout Drugs that affect Coumadin: You should take your Coumadin tablets 5mg, swallowed whole, with or without food once daily at the same time each day.
The dose you take will be individualised depending on your response to warfarin in Coumadin tablets 5mg, as determined by a blood test called the prothrombin time test PT , which measures how long your blood takes to clot. The test may vary depending on where you have it done but is standardised by the International Normalised Ratio, introduced by the World Health Organisation to control the measurement of coagulation. You will be regularly monitored and your dose may be adjusted until your clotting times have stabilised.
You should continue to take your Coumadin tablets 5mg for as long as recommended by your doctor, which will be for as long as you are at risk of thrombosis. How long should you take Coumadin? The condition is mainly observed in patients with end-stage renal disease on dialysis or in patients with known risk factors such as protein C or S deficiency, hyperphosphataemia, hypercalcaemia or hypoalbuminaemia.
Rare cases of calciphylaxis have been reported in patients taking warfarin, also in the absence of renal disease. In case calciphylaxis is diagnosed, appropriate treatment should be started and consideration should be given to stopping treatment with warfarin. For surgery where there is a risk of severe bleeding, warfarin should be stopped 3 days prior to surgery. Where it is necessary to continue anticoagulation e. If surgery is required and warfarin cannot be stopped 3 days beforehand, anticoagulation should be reversed with low-dose vitamin K.
The timing for re-instating warfarin therapy depends on the risk of post-operative haemorrhage. In most instances warfarin treatment can be re-started as soon as the patient has an oral intake. Dental Surgery Warfarin need not be stopped before routine dental surgery, eg, tooth extraction.
Active peptic ulceration Due to a high risk of bleeding, patients with active peptic ulcers should be treated with caution. Such patients should be reviewed regularly and informed of how to recognise bleeding and what to do in the event of bleeding occurring.
Interactions Many drugs and foods interact with warfarin and affect the prothrombin time see section 4. Patients should be instructed to inform their doctor before they start to take any additional medications including over the counter medicines, herbal remedies or vitamin preparations. Thyroid disorders The rate of warfarin metabolism depends on thyroid status. Be careful not to take more than one medication that contains warfarin unless specifically directed by the doctor or health care provider who is monitoring your warfarin treatment.
Older adults may be at greater risk for bleeding while using this drug. This medication is not recommended for use during pregnancy because of serious possibly fatal harm to an unborn baby. Discuss with your doctor the use of reliable forms of birth control while taking this medication and for 1 month after stopping the medication. If you become pregnant or think you may be pregnant, tell your doctor right away. If you are planning pregnancy, discuss a plan for managing your condition with your doctor before you become pregnant.
Your doctor may switch the type of medication you use during pregnancy. Very small amounts of this medication may pass into breast milk but is unlikely to harm a nursing infant. Consult your doctor before breast -feeding.
Interactions See also How to Use section. Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Do not start, stop, or change the dosage of any medicines without your doctor's approval. Warfarin interacts with many prescription, nonprescription, vitamin, and herbal products.
This includes medications that are applied to the skin or inside the vagina or rectum. The interactions with warfarin usually result in an increase or decrease in the " blood -thinning" anticoagulant effect. Eat a normal, balanced diet maintaining a consistent amount of vitamin K. Avoid drastic changes in dietary habits, such as eating large amounts of green leafy vegetables.
You should also avoid intake of cranberry juice or any other cranberry products. Notify your health care provider if any of these products are part of your normal diet. Contact physician to report any illness, such as diarrhea, infection or fever. Notify physician immediately if any unusual bleeding or symptoms occur.
Signs and symptoms of bleeding include: If therapy with warfarin sodium is discontinued, patients should be cautioned that the anticoagulant effects of warfarin sodium may persist for about 2 to 5 days.
Patients should be informed that all warfarin sodium, USP, products represent the same medication,and should not be taken concomitantly, as overdosage may result. A Medication Guide7 should be available to patients when their prescriptions for warfarin sodium are issued.
Carcinogenesis, mutagenesis, impairment of fertility Carcinogenicity and mutagenicity studies have not been performed with warfarin sodium. The reproductive effects of warfarin sodium have not been evaluated.
Pediatric use Safety and effectiveness in pediatric patients below the age of 18 have not been established, in randomized, controlled clinical trials. However, the use of warfarin sodium in pediatric patients is well-documented for the prevention and treatment of thromboembolic events. Warfarin sodium is contraindicated in any unsupervised patient with senility.
Caution should be observed with administration of warfarin sodium to elderly patients in any situation or physical condition where added risk of hemorrhage is present. This is a consequence of the anticoagulant effect. The signs, symptoms, and severity will vary according to the location and degree or extent of the bleeding.
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