Advil is a nonsteroidal anti-inflammatory drug (NSAID) that is commonly used to relieve pain, inflammation, and fever. However, long-term use of Advil can lead to stomach irritation, ulcers, and bleeding. To protect your stomach while taking Advil, you can follow these guidelines:

1. Take Advil with food or milk to reduce stomach irritation [2].
2. Do not take more than the recommended dose of Advil [2].
3. Do not take Advil for longer than necessary [2].
4. Avoid alcohol while taking Advil, as it can increase the risk of stomach bleeding [2].
5. If you have a history of stomach ulcers or bleeding, talk to your doctor before taking Advil [2].
6. Consider taking a proton pump inhibitor (PPI) or histamine-2 receptor antagonist (H2RA) to reduce the risk of stomach irritation and bleeding [3].

It is important to note that these guidelines are not a substitute for medical advice. If you have any concerns about taking Advil, talk to your doctor or pharmacist.

Sources:
[1] Drug Patent Watch. Advil. https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] Hospital for Special Surgery. Guidelines to Reduce the Side Effects of NSAIDs. https://www.hss.edu/conditions_guidelines-reduce-side-effects-nsaids.asp
[3] National Center for Biotechnology Information. StatPearls. Nonsteroidal Anti-inflammatory Drugs (NSAIDs). https://www.ncbi.nlm.nih.gov/books/NBK310269/