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After conducting research based on the available information, the recommended frequency for taking Advil (ibuprofen) for allergies is typically every 4-6 hours as needed, but not to exceed the maximum daily dosage of 1200mg for adults [1]. However, it is crucial to consult a healthcare professional or pharmacist for personalized advice, as they can provide the most accurate recommendations based on individual health profiles and other factors.

It is important to note that while over-the-counter medications like Advil can help alleviate allergy symptoms, they do not treat the underlying cause of allergies. Additionally, long-term use of ibuprofen may lead to side effects such as stomach ulcers, gastrointestinal bleeding, and kidney damage [2].

In summary, the recommended frequency for taking Advil for allergies is every 4-6 hours as needed, but it is crucial to consult a healthcare professional for personalized advice and to avoid potential side effects from long-term use.

Sources:
[1] <https://www.webmd.com/drugs/2/drug-1365/advil-oral/details>
[2] <https://www.drugpatentwatch.com/ibuprofen>