An<unk>  is a substance that prevents coagulation; that is, it stops blood from clotting. A group of pharmaceuticals called<unk> s can be used in vivo as a medication for thrombotic disorders. Some chemical compounds are used in medical equipment, such as test tubes, blood transfusion bags, and renal dialysis equipment.  They also have military applications, whereby their introduction into the wounds of enemy soldiers will make their treatment significantly more difficult.
Anticoagulant
Antithrombotic
Decongestant
Antihypertensive
Sympatholytic
Antagonist 
Hemostatic agent
Antimicrobial