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# Direct oral anticoagulants (DOACs)

Tablets or capsules that block one clotting enzyme directly: factor Xa or thrombin. No routine INR.

Updated 2026-11-01

## What they are

Oral anticoagulants that bind a single clotting enzyme directly, without antithrombin: factor Xa inhibitors (the -xabans) and the direct thrombin inhibitor dabigatran.

## Mechanism of action

Each drug binds its target enzyme directly. Rivaroxaban blocks free factor Xa and the Xa inside the prothrombinase complex, which cuts thrombin production; dabigatran blocks free and clot-bound thrombin. Either way less fibrin forms and thrombin-driven platelet aggregation falls.

Target: Factor Xa (xabans) or thrombin (dabigatran)

## Key points

- Xa inhibitors end in -xaban; dabigatran is the oral direct thrombin inhibitor.
- Not used with mechanical heart valves, and not recommended in triple-positive antiphospholipid syndrome: warfarin is used there.
- Kidney function matters most for dabigatran, which is cleared mainly by the kidneys.
- Specific antidotes: idarucizumab for dabigatran, andexanet alfa for rivaroxaban and apixaban.
- Stopping early without another anticoagulant raises the risk of clots and stroke.

## Drugs in this class

- [**Rivaroxaban** An oral anticoagulant that blocks factor Xa directly. It needs no routine INR, and andexanet alfa can reverse it. Coagulation factor Xa](https://durgical.com/en/pharmacology/rivaroxaban/)
- [**Dabigatran** An oral anticoagulant that blocks thrombin directly. It is cleared mainly by the kidneys and has its own antidote… Thrombin (coagulation factor IIa)](https://durgical.com/en/pharmacology/dabigatran/)
- [**Apixaban** An oral anticoagulant that blocks clotting factor Xa directly. Used in atrial fibrillation and venous thrombosis, with… Coagulation factor Xa](https://durgical.com/en/pharmacology/apixaban/)
- [**Edoxaban** A once-daily oral factor Xa inhibitor for atrial fibrillation and venous thrombosis. Half of it leaves through the… Coagulation factor Xa](https://durgical.com/en/pharmacology/edoxaban/)

## Others in the class

- apixaban
- edoxaban

## Test yourself

Think of the answer, then tap the question to see it.

## What separates a direct anticoagulant from heparin?

A direct anticoagulant binds factor Xa or thrombin itself. Heparin needs antithrombin as a go-between.

## What is the specific reversal agent for dabigatran, and for rivaroxaban?

Dabigatran: idarucizumab, an antibody fragment that binds it. Rivaroxaban: andexanet alfa, an inactive modified factor Xa that binds and holds the drug.

## In which two settings is warfarin preferred over a DOAC?

Mechanical heart valves and triple-positive antiphospholipid syndrome, where DOACs led to more clots.

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Educational content on how drugs work; not a prescribing guide and no substitute for a health professional's advice. No doses are given.

Sources: [DailyMed - RIVAROXABAN tablet](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=122e6f78-067b-9065-adb2-ec7fec9f008e) (DailyMed (U.S. National Library of Medicine), 2026); [DailyMed - DABIGATRAN- dabigatran etexilate capsule](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=6f79088b-b353-485a-9df4-6f5088f5bd0f) (DailyMed (U.S. National Library of Medicine), 2026); [eEML - Electronic Essential Medicines List](https://list.essentialmeds.org/?query=dabigatran) (World Health Organization, 2025).

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Representative model, for educational purposes only.

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License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/pharmacology/classes/direct-oral-anticoagulants/