Dabigatran
Overview
Dabigatran is a direct oral anticoagulant (DOAC) that helps prevent blood clots from forming in the body. It is frequently prescribed to reduce the risk of stroke and systemic embolism in patients with nonvalvular atrial fibrillation, and is also indicated for the treatment and prevention of deep vein thrombosis (DVT) and pulmonary embolism (PE).
Mechanism of Action
Unlike apixaban and rivaroxaban which inhibit Factor Xa, dabigatran acts as a potent, competitive, and reversible direct thrombin inhibitor. Thrombin is the final enzyme in the clotting cascade responsible for converting fibrinogen into fibrin. By directly binding to and inhibiting thrombin, dabigatran prevents the formation of fibrin clots and inhibits thrombin-induced platelet aggregation.
Dosage and Administration
For stroke prevention in atrial fibrillation, the standard adult dose is 150 mg twice daily. A reduced dose of 110 mg twice daily is recommended for patients aged 80 or above, or those with an increased risk of bleeding. It is administered as a capsule that must be swallowed whole, not chewed or opened, as this significantly increases absorption and the risk of bleeding. Routine coagulation monitoring is not required.
Side Effects
The most significant risk is bleeding, which can be serious or fatal. Dabigatran is also uniquely associated with a higher incidence of gastrointestinal side effects compared to other DOACs, particularly dyspepsia (indigestion), stomach pain, and gastroesophageal reflux.
Contraindications
It is contraindicated in patients with active pathological bleeding, severe renal impairment, or known hypersensitivity to dabigatran. It should not be used in patients with mechanical prosthetic heart valves, as it increases the risk of valve thrombosis and bleeding.
Pregnancy and Lactation
It should be avoided during pregnancy unless clearly necessary, as its safety has not been fully established. It is unknown whether dabigatran is excreted in human milk; therefore, breastfeeding is generally not recommended during treatment.
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