Combining Advil (ibuprofen) with allergy medication like Benadryl (diphenhydramine) may not be safe for everyone. Both Advil and Benadryl can cause drowsiness and dizziness, and combining them can intensify these side effects. It is always recommended to consult with a healthcare provider or pharmacist before combining medications to ensure safety and effectiveness. According to Drug Patent Watch [1], there are no specific patents related to the combination of Advil with allergy medication. Advil's official website [2] advises caution when combining medications and suggests seeking medical advice. CareCard [3] also emphasizes the importance of consulting a healthcare professional before taking ibuprofen and Benadryl together to avoid potential interactions or adverse effects.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.advil.com/advil-safety/combining-medications/
[3] https://carecard.com/blog/can-i-take-ibuprofen-and-benadryl-together