Based on the provided sources, it is unclear whether you can stack Advil rebates with coupons.

Drug Patent Watch [1] provides information about the Advil trademark and its active ingredient, ibuprofen. However, it does not provide any information about Advil rebates or coupons.

The Advil website [2] offers information about Advil products, but it does not mention anything about rebates or coupons.

The Kroger Krazy website [3] provides printable coupons for various products, including Advil. However, there is no information on the website about whether these coupons can be stacked with Advil rebates.

Therefore, it is recommended that you contact Advil's customer service or check the terms and conditions of any Advil rebates or coupons to determine whether they can be stacked.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.advil.com/
[3] https://www.krogerkrazy.com/category/a1-most-used-categories/printable-coupons/page/2/