What to know about blood thinners after a crash
A trauma care provider and a clinical pharmacist on weighing the risks of bleeding and clots
Some people were already on a blood thinner when the crash happened. Others start one afterward, since an injury and moving less can raise the risk of a clot. The trauma team weighs the danger of bleeding against the danger of clotting. A pharmacist checks the exact drug, the dose, possible interactions and the follow up plan. “Blood thinner” is a broad term. The name of your own medicine matters. [1, 2]
Learn why you're taking it
Ask what the medicine is for. It may prevent a clot, treat one or guard against another condition, such as an irregular heartbeat. If it was put on hold because of bleeding or surgery, get the plan for restarting it in writing. If it’s new, ask how long you’ll likely be on it and who can change the plan. Don’t reach for an old bottle to cover a gap without checking first. [1, 2]
Get the dosing details down exactly
Write down the drug’s name, dose and time of day. Add what to do after a missed dose and when your monitoring visits are. Some of these medicines need blood tests. Others have a different kind of follow up. [1]
Talk to a pharmacist before you add a nonprescription pain reliever, supplement or herbal product. These can interact with your medicine and raise the risk of bleeding. Never double up after a missed dose unless your prescriber has told you to for your specific drug. [1]
Bleeding that needs a call or an emergency visit
Call promptly if you notice red or dark urine, black or bloody stool or vomiting blood. Large, unusual bruises and bleeding that won’t stop also need a quick call. A severe headache, fainting or weakness needs an emergency exam, even if you see no blood. The same is true after a serious fall or a blow to the head. Tell the emergency team the name of your medicine and when you last took it. [1]
You still need to watch for signs of a clot while on a blood thinner. New swelling or pain in a leg should be checked promptly. Sudden shortness of breath or chest pain calls for emergency care. Keep a single, current medicine list. Bring it to every visit so everyone treating you sees the same plan. [1, 2]
Ask your prescriber
- Why am I on this medicine right now?
- When will it stop or be reviewed, and who makes that call?
- What should I do if I miss a dose or hit my head?
Put the prescriber's number on your list
Sources and further reading
This article offers general information from trauma care and pharmacy. Don’t stop, restart or double a blood thinner unless your care team tells you to. A head injury or serious bleeding needs urgent care.
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