Should I take aspirin and blood thinners together?
You usually should not start aspirin or “blood thinners” on your own. Whether you should take them together depends on why you’re taking them (for example, atrial fibrillation, prior stroke, a heart stent, or a recent clot) and on your bleeding risk.
Using aspirin and prescription blood thinners at the same time can raise the chance of serious bleeding, including stomach bleeding and brain bleeding. In many situations, doctors prescribe only one (or a specific combination for a limited time) based on your risk of clotting versus bleeding.
When doctors recommend aspirin (and when they don’t)
Doctors may recommend aspirin if you have atherosclerotic cardiovascular disease, such as:
- Prior heart attack or certain types of stroke
- Coronary artery disease or after some stent procedures
But aspirin is not appropriate for everyone. If you have a history of significant bleeding (like a gastrointestinal bleed), certain bleeding disorders, uncontrolled high blood pressure, or are on other medications that increase bleeding risk, aspirin may be avoided or used with caution.
When doctors recommend prescription blood thinners
“Blood thinners” usually means anticoagulants such as:
- Warfarin
- Apixaban, rivaroxaban, edoxaban, dabigatran (often called DOACs)
- Heparin/enoxaparin (commonly in the hospital or short-term)
These are typically used to prevent stroke from atrial fibrillation, treat or prevent DVT/PE, or prevent clots after certain cardiac procedures. The need for an additional aspirin depends on the specific condition and timing of any heart procedure.
What happens if you combine aspirin with anticoagulants?
Combining aspirin with anticoagulants can increase bleeding risk. Some patients may be prescribed both after a stent or acute coronary syndrome, but that regimen is usually time-limited and tailored to the individual. If you take both without a clinician’s plan, you may be exposed to unnecessary bleeding risk.
What side effects or warning signs mean you should get help now?
Seek urgent care or emergency help if you have:
- Black/tarry stools, vomiting blood, or severe stomach pain
- Unusual bruising, bleeding that won’t stop, or nosebleeds that are hard to control
- Severe headache, weakness/numbness on one side, confusion, or trouble speaking (possible bleeding in the brain)
- Vomiting with blood or coffee-ground material
The safest next step
If you tell me:
1) your age,
2) what condition you’re treating (heart stent? atrial fibrillation? prior clot or stroke?),
3) the exact medication names and doses you’re considering, and
4) any history of ulcers/bleeding, kidney disease, liver disease, or falls,
…I can explain what questions to ask your clinician and what’s commonly done for that situation.
If you are already taking either aspirin or a blood thinner and are thinking about adding the other, do not start or stop anything until you’ve checked with your prescriber or pharmacist.