Warfarin Tablets
- Warfarin Tablets BP 5 mg
Therapeutic Class: Cardiovascular Agents
Dosage Forms: Tablets
Brand Name: Warfarin™
How it works?
Uses of Warfarin Tablets
This medicine is indicated for the prophylaxis of systemic embolization in patients with rheumatic heart disease and atrial fibrillation.
it is indicated for prophylaxis after insertion of prosthetic heart valves.
it is indicated for the prophylaxis and treatment of venous thrombosis and pulmonary embolism.
it is indicated for transient cerebral ischemic attacks.
Precautions of Warfarin Tablets
If a rapid antithrombotic effect is needed, heparin treatment must be initiated first. After this, heparin treatment is continued for at least 5 to 7 days until the INR has been at the target level for at least two days.
Interactions
There is a large risk for interactions when this anticoagulant is used concomitantly with other drugs. Intensified monitoring of the therapeutic response is therefore recommended when treatment with other drugs is initiated or withdrawn.
Genetic variations
Elimination of this anticoagulant is slower in patients with certain mutations in the gene for the enzyme CYP2C9 metabolizing (S)-anticoagulant. These patients only require a low maintenance dose and have a risk of excessive bleeding if a high initial dose is given. It will also take longer to achieve the new efficacy level after adjusting the dose. Additionally, patients with genetic variations of the enzyme VKOR may require lower doses due to increased sensitivity to the drug.
Resistance
Resistance to this anticoagulant is a very rare phenomenon. Only case reports have been published on that. These patients need 5 to 20 times the usual doses to achieve a therapeutic response. If the patient’s response is poor, other more plausible causes should be ruled out: patient noncompliance, interaction with other medications or food, and laboratory errors.
Coumarin necrosis
To avoid coumarin necrosis, patients with a hereditary deficiency of antithrombotic proteins C or S must first be treated with heparin. Loading doses of this anticoagulant must not exceed 5 mg. Heparin treatment must be continued for 5 to 7 days as described above.
Dosages administration of Warfarin Tablets
Adults and elderly patients: The typical induction dose of this tablet is 10 mg daily for 2 days, but this should be tailored to individual requirements. Baseline prothrombin measurements (PT) should be taken before beginning therapy with this tablet.
The daily maintenance dose of these tablets is usually 3 to 9 mg taken at the same time each day. The exact maintenance dose for an individual is dependent on the prothrombin time or other appropriate coagulation tests. The maintenance dose is omitted if the prothrombin time is excessively prolonged. 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 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 it is maintenance dosage further adjusted according to the results obtained.
Paediatric population: No data are available.
Side effects of Warfarin Tablets
The following are the side-effects of Warfarin Tablets
| Immune system disorders | Fever |
| Nervous system disorders | Hypersensitivity |
| Vascular disorders | Cerebral haemorrhage; Cerebral subdural haematoma |
| Respiratory, thoracic and mediastinal disorders | Haemorrhage |
| Gastrointestinal disorders | Haemothorax, epistaxis |
| Hepatobiliary disorders | Gastrointestinal hemorrhage, rectal haemorrhage, hematemesis, pancreatitis; diarrhea, nausea; vomiting, and melena |
| Skin and subcutaneous disorders | Jaundice; hepatic dysfunction |
| Renal and Urinary disorders | Rash; alopecia; purpura; ‘purple toes’ syndrome; erythematous swollen skin patches leading to ecchymosis, infarction and skin necrosis; calciphylaxis |
Storage instruction of Warfarin Tablets
Store below 30°C and protect from light and moisture.
Keep out of reach of children.
Packing details of Warfarin Tablets
1 x10 Alu/PVC blister
Tablets BP 5 mg are available in an Alu/PVC blister of 10 tablets. Such 01 blister in a carton with pack insert.
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