Taking Advil with blood thinners is not recommended. Advil is a nonsteroidal anti-inflammatory drug (NSAID) that can increase the risk of bleeding when taken with blood thinners such as warfarin, heparin, or aspirin. NSAIDs work by blocking the production of certain chemicals in the body that cause inflammation, pain, and fever. However, this also inhibits the production of prostaglandins, which are important in blood clotting [2].

According to the Advil website, people who are taking blood thinners or have a bleeding disorder should not take Advil without consulting their doctor [3]. Similarly, the Harvard Health Blog warns that taking NSAIDs with blood thinners can increase the risk of bleeding, which can be dangerous, especially for people who are already at risk for bleeding [2].

It is important to talk to a doctor before taking Advil or any other medication, especially if you are taking blood thinners or have a bleeding disorder. The doctor can advise on the appropriate dosage and whether it is safe to take the medication with blood thinners [2].

In summary, taking Advil with blood thinners is not recommended due to the increased risk of bleeding. People who are taking blood thinners or have a bleeding disorder should consult their doctor before taking Advil or any other medication [2][3].

Sources:
[2] "Bad mix: Blood thinners and NSAIDs." Harvard Health Blog. https://www.health.harvard.edu/diseases-and-conditions/bad-mix-blood-thinners-and-nsaids
[3] "Pre-existing health conditions." Advil. https://www.advil.com/advil-safety/pre-existing-health-conditions/