Advil is a brand name for the drug ibuprofen, which is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain, reduce fever, and decrease inflammation. According to the Advil website [2], the recommended dosage for adults is one or two tablets every four to six hours, with a maximum daily dose of six tablets in 24 hours. It is important to follow the recommended dosage and not exceed the maximum daily dose, as this can increase the risk of side effects such as stomach bleeding, kidney damage, and liver damage.

As for how long you should wait to take Advil again, it is recommended to wait at least four hours between doses [3]. This is because the effects of ibuprofen usually last for about four to six hours, and taking another dose too soon can increase the risk of side effects and overdose. It is also important to note that ibuprofen should not be taken for more than 10 days unless directed by a doctor.

It is always a good idea to consult with a healthcare professional before taking any medication, especially if you have a medical condition or are taking other medications. They can provide personalized advice on dosage and frequency based on your individual needs and health status.

Sources:
[2] https://www.advil.com/faqs-en/advil-pain/
[3] https://www.drugs.com/medical-answers/how-often-can-you-take-ibuprofen-3016181/
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL