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Combining aspirin and blood thinners can increase the risk of serious side effects, such as bleeding. Aspirin and blood thinners, also known as anticoagulants, are both medications that prevent blood clots from forming, but they work in different ways. Aspirin works by reducing the stickiness of platelets, the cells involved in blood clotting, while blood thinners work by slowing down the clotting process.

When taken together, the effects of these medications can be amplified, increasing the risk of bleeding. This risk is especially high in elderly patients and those with pre-existing medical conditions such as liver or kidney disease, stomach ulcers, or uncontrolled high blood pressure.

It is important to note that the decision to combine aspirin and blood thinners should be made by a healthcare professional, taking into account the individual patient's medical history and current medications. The patient should also be closely monitored for any signs of bleeding or other side effects.

It is also important to be aware that over-the-counter medications, such as non-steroidal anti-inflammatory drugs (NSAIDs), can also interact with blood thinners and increase the risk of bleeding.

In summary, combining aspirin and blood thinners can increase the risk of bleeding, and this decision should be made by a healthcare professional.

Sources:

* [Mayo Clinic. (2021). Blood thinners: Are they safe to use with aspirin?](https://www.mayoclinic.org/diseases-conditions/heart-disease/expert-answers/blood-thinners/faq-20058003)
* [American Heart Association. (2021). Blood Thinners.](https://www.heart.org/en/health-topics/heart-attack/treatment-of-a-heart-attack/blood-thinners)
* [Drugs.com. (2021). Aspirin and Blood Thinners Interaction.](https://www.drugs.com/drug-interactions/aspirin-and-blood-thinners-20-22.html)
* [DrugPatentWatch.com. (2021). Blood Thinners.](https://www.drugpatentwatch.com/drug/blood_thinners.html)