“Hemophilia is a rare disorder in which the blood doesn’t clot in the typical way because it doesn’t have enough blood-clotting proteins (clotting factors). 

The main treatment for severe hemophilia involves replacing the clotting factor you need through a tube in a vein.

This replacement therapy can be given to treat a bleeding episode in progress. It can also be given on a regular schedule at home to help prevent bleeding episodes. Some people receive continuous replacement therapy.

Replacement clotting factor can be made from donated blood. Similar products, called recombinant clotting factors, are made in a laboratory, not from human blood.”

MAYO CLINIC (https://www.mayoclinic.org/diseases-conditions/hemophilia/diagnosis-treatment/drc-20373333)