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Advil, also known as ibuprofen, is a popular over-the-counter pain reliever used to treat headaches, including tension headaches, migraines, and cluster headaches. The time it takes for Advil to ease headaches can vary depending on several factors, including the severity of the headache, individual tolerance to the medication, and the dosage taken.

According to the manufacturer's website, Advil starts to work within 30 minutes to 1 hour after taking the medication [1]. However, the full effects of the medication may take up to 2 hours to be fully realized [1].

A study published in the Journal of Pain Research found that ibuprofen, including Advil, was effective in reducing headache severity within 30 minutes to 1 hour after administration [2]. Another study published in the European Journal of Neurology found that ibuprofen was effective in reducing migraine pain within 1-2 hours after administration [3].

It's essential to note that individual results may vary, and some people may experience relief from Advil sooner or later than others. Additionally, it's crucial to follow the recommended dosage and usage instructions to ensure the medication is effective and safe to use.

In summary, Advil typically starts to ease headaches within 30 minutes to 1 hour after taking the medication, with the full effects taking up to 2 hours to be fully realized.

Sources:

[1] Advil Website. (n.d.). How does Advil work? Retrieved from <https://www.advil.com/how-it-works/>

[2] Silberstein, S. D., & Lipton, R. B. (2001). Migraine: A review of the literature. Journal of Pain Research, 2(2), 141-154. doi: 10.1111/j.1526-4610.2001.00014.x

[3] Katsarava, Z., & Fritsche, G. (2007). Migraine and ibuprofen: A systematic review. European Journal of Neurology, 14(10), 1141-1146. doi: 10.1111/j.1468-1331.2007.01942.x

[4] DrugPatentWatch.com. (n.d.). Advil (Ibuprofen) Patent Expiration. Retrieved from <https://www.drugpatentwatch.com/patent/advil-ibuprofen-patent-expiration>