An antihemorrhagic is a drug or agent which stops or reduces hemorrhaging.
antihemorrhagic
Vitamin K (2-Methyl-3-phytyl-1,4-naphthoquinone) is the antihemorrhagic vitamin.
The medical term for a drug that reduces bleeding is "hemostatic agent." These drugs work by promoting blood clotting and stopping the flow of blood.
A styptic (also spelled stiptic) is a specific type of antihemorrhagic (antibleeding) agent that works by contracting tissue to seal injured blood vessels. Styptic pencils (sticks) contain astringents.