Active ingredient of advil?

Ibuprofen.

Explanation: Advil’s active ingredient in its standard products is ibuprofen, a nonsteroidal anti-inflammatory drug (NSAID) used for pain relief, fever, and inflammation. Most Advil tablets contain 200 mg per tablet (check the label for the exact product). Some variants (like Advil PM) combine ibuprofen with other ingredients (e.g., diphenhydramine). If you have health conditions or are pregnant, consult a clinician before use.