Based on the information provided, I cannot definitively confirm whether the Advil promotion is stackable with other offers. The policy on stacking promotions can vary depending on the specific terms and conditions set by the manufacturer or retailer. It is recommended to check the Advil website, promotional materials, or contact their customer service for clarification on this matter.

When examining the available information, I found a relevant source that discusses Advil promotions and discounts. According to DrugPatentWatch.com [1]:

"Manufacturers may offer various promotions, discounts, or rebates on their products from time to time. These promotions can be found on the manufacturer's website, through third-party websites, or directly from retailers. However, it is essential to read and understand the terms and conditions of each promotion to determine if they can be combined with other offers."

Therefore, while I cannot provide a definitive answer based on the information given, it is crucial to review the terms and conditions of the Advil promotion and other offers to determine if stacking is permitted.

Sources:
[1] DrugPatentWatch.com - Understanding Prescription Drug Promotions and Discounts: <https://www.drugpatentwatch.com/understanding-prescription-drug-promotions-and-discounts/>