Tylenol is a popular over-the-counter medication used to treat pain and fever. According to the official Tylenol website [3], adults can take 2 tablets every 4 to 6 hours, but should not exceed 8 tablets in a 24-hour period. It is important to follow the recommended dosage to avoid potential side effects, such as liver damage.

The active ingredient in Tylenol is acetaminophen, which is generally considered safe when taken as directed [2]. However, it is important to be cautious and avoid taking more than the recommended dose. Acetaminophen can be harmful to the liver, especially when combined with alcohol or taken in large amounts [2].

It is generally recommended to wait at least 4 hours between doses of Tylenol [1]. This is because the medication takes time to be metabolized by the body and can build up to dangerous levels if taken too frequently. Additionally, taking Tylenol too often can lead to rebound headaches, where the medication actually causes headaches instead of relieving them [2].

In summary, adults should take no more than 8 tablets of Tylenol in a 24-hour period, with at least 4 hours between doses. It is important to follow the recommended dosage to avoid potential side effects, and to be cautious when taking acetaminophen to protect the liver [1][2][3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/TYLENOL
[2] https://www.health.harvard.edu/pain/acetaminophen-safety-be-cautious-but-not-afraid
[3] https://www.tylenol.com/safety-dosing/dosage-for-adults