I have a friend that has MS and has to take shots. He took a shot and there was a lot of blood that followed after he took the needle out. I was thinking his blood was too thin.  (I take warfarine and this is why I was concerned) He drinks a lot of Red Bulls drinks too.
Hi, dear. I have gone through your question. I can understand your concern. You are taking warfarin.  It is oral anticoagulant Chat Doctor.  It prevents clotting of blood.  So it leads to bleeding.  You should test your PT and INR. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using Chat Doctor. Wish you a very good health. Don't forget to click, thank you.