Hi, one of my main characters has Hemophilia and i did a lot of research but one question has been bugging me. My main characters get into a lot of dangerious trouble and i know that can complicate things with someone who has hemophilia, I was thinking he would get regular injections of his clotting factor VIII for hemophilia A but with regular injections can you also use on-demand injections if a serious injury accurs or just as an "In case" measure? And if so what exactly do on demand injections look like? syringe and little glass bottle?