Advil is a popular over-the-counter pain reliever that contains ibuprofen as its active ingredient. According to the manufacturer's website [2], Advil has a shelf life of three years from the date of manufacture. After this time, the effectiveness of the medication may decrease, and it may not provide the intended relief. However, it is important to note that the expiration date is not a hard and fast rule, and the medication may still be safe and effective for some time after the expiration date.

The Drug Patent Watch website [1] confirms that Advil's patent has expired, meaning that other companies can now produce generic versions of the drug. This information is relevant because it confirms that the medication has been on the market for a significant amount of time and that its safety and efficacy have been established through numerous studies and trials.

An article from Insider [3] notes that many medications, including Advil, may be safe and effective for several years after the expiration date if they are stored properly. However, the article also notes that the effectiveness of the medication may decrease over time, and there is a risk of bacterial growth or contamination if the medication is not stored properly.

In conclusion, Advil has a shelf life of three years from the date of manufacture, but it may still be safe and effective for some time after the expiration date if it is stored properly. However, it is always best to check with a healthcare professional before taking any medication past its expiration date.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.advil.com/advil-safety/expiration-disposal-storage/
[3] https://www.insider.com/how-long-can-you-take-medicine-after-expiration-date-2019-2