Advil is a brand name for ibuprofen, which is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain, fever, and inflammation. According to the NHS, the recommended dose of ibuprofen for adults is 200mg to 400mg three to four times a day, with a maximum daily dose of 1200mg. However, the dose may vary depending on the individual's condition, age, and medical history.

Advil PM is a combination of ibuprofen and diphenhydramine, which is an antihistamine used as a sleep aid. According to the Advil website, the recommended dosage for Advil PM caplets is two caplets at bedtime, which contains a total of 400mg of ibuprofen and 50mg of diphenhydramine. It is essential to follow the recommended dosage and not exceed the maximum daily dose of ibuprofen to avoid potential side effects such as stomach bleeding, kidney problems, and heart attack.

It is always recommended to consult with a healthcare professional before taking any medication, especially if you have any underlying medical conditions or taking other medications. Additionally, it is not recommended to take Advil or any other NSAIDs for an extended period without consulting a healthcare professional [3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.advil.com/what-recommended-dosage-advil-pm-caplets/
[3] https://www.nhs.uk/medicines/ibuprofen-for-adults/