Advil is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain, fever, and inflammation. Antihistamines, on the other hand, are medications used to treat allergy symptoms such as sneezing, runny nose, itching, and watery eyes. According to Drugs.com [3], Advil may interact with some antihistamines, such as diphenhydramine (Benadryl), chlorpheniramine (Chlor-Trimeton), and brompheniramine (Dimetapp). These interactions may increase the risk of side effects such as drowsiness, dizziness, and difficulty concentrating. Therefore, it is recommended to avoid taking these antihistamines with Advil or to use them cautiously and under the supervision of a healthcare provider. It is always important to consult with a healthcare provider or pharmacist before combining medications to avoid potential interactions and ensure safe and effective use.

Sources:
[3] "Advil and Benadryl Drug Interactions." Drugs.com, 2021, https://www.drugs.com/drug-interactions/advil-with-benadryl-1310-782-896-1617.html.
[2] "Combining Medications Safely." Advil, 2021, https://www.advil.com/advil-safety/combining-medications/.
[1] "Advil Tradename Details." DrugPatentWatch, 2021, https://www.drugpatentwatch.com/p/tradename/ADVIL.