According to the sources provided, the frequency of taking Advil (ibuprofen) depends on the individual's age, weight, and medical condition. Advil is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain, fever, and inflammation. It is available over-the-counter (OTC) and in prescription form.

The recommended dosage for adults is 200-400 mg every four to six hours, not to exceed 1200 mg in 24 hours [2]. However, it is essential to consult a healthcare professional before taking Advil, especially if one has a history of stomach ulcers, liver or kidney disease, or is taking other medications [2].

For children, the dosage depends on their weight and age. The recommended dose for children aged 6 months to 11 years is 5-10 mg/kg every six to eight hours, not to exceed 40 mg/kg in 24 hours [2].

It is crucial to follow the recommended dosage and not exceed the maximum daily dose to avoid adverse effects such as stomach bleeding, kidney damage, and liver damage [3]. Additionally, Advil should not be taken for more than ten days unless directed by a healthcare professional [2].

In conclusion, the frequency of taking Advil depends on various factors, including age, weight, and medical condition. It is essential to follow the recommended dosage and consult a healthcare professional before taking Advil to avoid adverse effects.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.advil.com/faqs-en/advil-pain/
[3] https://www.usatoday.com/story/news/2023/03/11/how-often-can-you-take-advil/11230106002/