There is no information available in the provided sources regarding any restrictions on Advil discounts. The first source, Drug Patent Watch, provides information on the patent status of Advil, but does not mention any restrictions on discounts. The second and third sources, Advil's official website and Motrin's official website, respectively, offer discounts and coupons for Advil and Motrin products, but do not specify any restrictions on these offers. It is recommended to read the terms and conditions of any specific discount or coupon offer before using it to ensure eligibility and any potential restrictions.

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