Advil is a brand name for ibuprofen, a nonsteroidal anti-inflammatory drug (NSAID) that is commonly used to relieve pain and reduce inflammation. Blood thinners, also known as anticoagulants, are medications that are used to prevent blood clots from forming or getting bigger.

According to Harvard Health Publishing [2], taking NSAIDs like Advil can increase the risk of bleeding in people who are taking blood thinners. This is because NSAIDs can interfere with the blood-thinning effects of these medications, which can lead to an increased risk of bleeding. Therefore, it is generally not recommended to take Advil or other NSAIDs while taking blood thinners.

The Advil website [3] also states that people who are taking blood thinners should talk to their doctor before taking Advil or any other NSAID. This is because blood thinners can interact with other medications, including NSAIDs, and may increase the risk of bleeding or other side effects.

It is important to note that the information provided in these sources is general in nature and may not apply to everyone. It is always best to consult with a healthcare professional before taking any new medications, especially if you are already taking blood thinners or have other pre-existing health conditions [3].

Sources:
[2] https://www.health.harvard.edu/diseases-and-conditions/bad-mix-blood-thinners-and-nsaids
[3] https://www.advil.com/advil-safety/pre-existing-health-conditions/