After reviewing the sources provided, there is no mention of any coupons available for online purchases of Advil. The first source, Drug Patent Watch [1], provides information on the patent status of Advil and its active ingredient, ibuprofen. The second and third sources, Advil [2] and Motrin [3], are the official websites for the brand and provide information on the products, their uses, and dosages. However, neither website mentions any coupons or discounts for online purchases of Advil.

It is possible that there may be coupons or discounts available through third-party websites or retailers that sell Advil. It may be worth checking with online retailers such as Amazon or Walmart, or checking coupon websites such as Coupons.com or RetailMeNot for any available deals. It is important to note that any coupons or discounts found should be verified for authenticity and expiration dates before use.

In conclusion, based on the sources provided, there is no information on any coupons or discounts available for online purchases of Advil on the official brand websites. It is recommended to check with third-party retailers or coupon websites for any available deals.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.advil.com/
[3] https://www.motrin.com/