Advil is a brand name for ibuprofen, which is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain and reduce fever. According to the sources provided, the recommended dosage for adults is 200-400mg every four to six hours, not exceeding 1200mg in 24 hours [1][2][3]. However, taking Advil regularly or too often can have potential side effects, including gastrointestinal problems, kidney damage, and increased risk of heart attack or stroke [2][3]. Therefore, it is important to follow the recommended dosage and not exceed the maximum daily limit of 1200mg [1][2][3]. It is also advisable to consult with a doctor before taking Advil regularly or for an extended period, especially if the individual has a history of gastrointestinal problems, kidney disease, or heart disease [2]. In summary, taking Advil every four to six hours within the recommended dosage and not exceeding 1200mg in 24 hours is safe for most adults, but taking it regularly or too often can have potential side effects [1][2][3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://healthmatters.wphospital.org/blog/april/2021/dear-doctor-is-ibuprofen-safe-to-take-regularly/
[3] https://www.usatoday.com/story/news/2023/03/11/how-often-can-you-take-advil/11230106002/