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Anticoagulants or blood thinners are chemicals that reduce or prevent coagulation of blood and increases the clotting time. These chemicals are naturally present in blood-eating animals like mosquitoes and leeches that allow the bite area to be un-clotted to suck blood to normalize the Blood Pressure.

In diseases like Coronary artery disease, Atrial fibrillation, Ischemic stroke, Deep vein thrombosis, Pulmonary embolism, Restenosis from stents, Hypercoagulable conditions like Factor V Leiden, Myocardial infarction, etc anticoagulants help in the prevention of formation of clots and restrict its growth

TYPES of Anticoagulant

Novel oral anticoagulant or Non Vitamin K antagonist oral anticoagulant Example (NOACs)

They inhibit the formation of clots but are not Vitamin K antagonists. They include rivaroxaban, apixaban, dabigatran etc. They have comparatively shorter half-lives and rapid action than warfarin and are a lot more expensive than them.

Coumarins (vitamin K antagonists)

the most important medicine in this class is warfarin. It takes 42 to 72 hours for the development of anti-coagulation. Other medicines belonging to this class include phenindione, phenprocoumon, acenocoumarol, and tormenting.

Heparin and derivative substances

Heparin is made from the intestines of pig. It acts by activating antithrombin III, which in turn prevents thrombin from clotting blood. Heparin is used both in-vivo and in-vitro for blood clotting.

Low molecular weight heparin

it is a more processed form of heparin and is frequently used since has fewer side effects and it does not require monitoring of APTT coagulation parameters.

Synthetic pentasaccharide inhibitors of factor Xa- Idraparinux, Fondaparinux 

Direct factor Xa inhibitors

Direct factor Xa inhibitor Example Apixaban, edoxaban, betrixaban, eribaxaban, letaxaban, darexaban, rivaroxaban etc.

Direct thrombin inhibitors

Direct thrombin inhibitors– ximelagatran, argatroban, lepirudin, hirudin, bivalirudin and dabigatran.

Antithrombin protein therapeutics– it is obtained from human plasma 

Other types

Other types of anticoagulants- Batroxobin (from snake’s venom), Hementin (from Amazon leech Haementeria ghilianii), Vitamin E


  • Elderly patients may be more susceptible to bleeding.
  • Patients with recent surgeries, cerebral aneurysms have a greater risk of bleeding


The information given in this write-up is purely for educating the reader. It is not meant to be a substitute for any advice from a medical expert.

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Brief about Anticoagulant Example

Dr. Ozair

Written by Dr. Ozair (CEO of as physician writers are physicians who write creatively in fields outside their practice of medicine.