Tylenol, also known as acetaminophen, is a common over-the-counter pain reliever and fever reducer. According to Drug Patent Watch [1], Tylenol is not classified as a blood thinner. It works by blocking the production of prostaglandins, which are chemicals that cause pain and inflammation in the body.

Healthline [2] also states that Tylenol does not affect blood clotting levels. However, it is important to note that taking too much Tylenol can cause liver damage. The recommended maximum daily dose of Tylenol for adults is 4,000 milligrams, or eight extra-strength tablets.

According to the University of Rochester Medical Center [3], blood tests are not necessary to monitor Tylenol levels in the blood. However, if someone has taken a potentially toxic amount of Tylenol, a blood test can be used to determine the level of the drug in their system.

In conclusion, based on the sources provided, Tylenol is not a blood thinner and does not affect blood clotting levels. However, it is important to follow the recommended dosage guidelines to avoid potential liver damage.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/TYLENOL
[2] https://www.healthline.com/health/is-tylenol-a-blood-thinner
[3] https://www.urmc.rochester.edu/encyclopedia/content.aspx?contenttypeid=167&contentid=acetaminophen_drug_level