Advil is a nonsteroidal anti-inflammatory drug (NSAID) that is commonly used to relieve pain and reduce inflammation. Like all medications, Advil may cause side effects in some individuals. According to MedlinePlus [3], the most common side effects of Advil include upset stomach, nausea, vomiting, stomach pain, headache, dizziness, and drowsiness. These side effects are usually mild and go away on their own within a few days. However, if these symptoms persist or worsen, it is important to contact a healthcare provider.

More serious side effects of Advil can occur, but they are rare. These include allergic reactions, such as hives, rash, itching, and difficulty breathing. Other serious side effects may include stomach ulcers, bleeding, and kidney problems. It is important to seek medical attention immediately if any of these symptoms occur [3].

According to GoodRx [2], Advil can also interact with other medications, such as blood thinners, steroids, and antidepressants. It is important to inform your healthcare provider of all medications you are taking before starting Advil.

It is important to note that not everyone will experience side effects from Advil, and many people take the medication without any problems. However, if you are concerned about the potential side effects of Advil, it is important to speak with your healthcare provider before taking the medication.

Sources:
[2] https://www.goodrx.com/advil/advil-side-effects
[3] https://medlineplus.gov/druginfo/meds/a682159.html