Advil is a brand name for ibuprofen, which is a nonsteroidal anti-inflammatory drug (NSAID) used to treat pain, fever, and inflammation. While Advil is generally considered safe when used as directed, there are potential side effects that users should be aware of.

Common side effects of Advil include upset stomach, nausea, vomiting, diarrhea, constipation, dizziness, and headache. These side effects usually go away on their own and do not require medical attention. However, if they persist or become severe, it is important to seek medical advice.

In some cases, Advil can cause more serious side effects, such as stomach ulcers, bleeding, kidney problems, and allergic reactions. These side effects are rare but can be life-threatening. Symptoms of stomach ulcers and bleeding include stomach pain, black or bloody stools, and vomiting blood. Symptoms of kidney problems include swelling in the legs or feet, decreased urine output, and fatigue. Symptoms of an allergic reaction include hives, rash, itching, and difficulty breathing.

It is important to use Advil as directed and to talk to a healthcare provider before taking it if you have a history of stomach ulcers, bleeding, kidney problems, or allergies. Advil should not be used in the last three months of pregnancy, as it can harm the unborn baby.

In conclusion, Advil is generally safe when used as directed, but it can cause side effects, including upset stomach, nausea, vomiting, and more serious side effects such as stomach ulcers, bleeding, kidney problems, and allergic reactions. It is important to talk to a healthcare provider before taking Advil if you have a history of medical problems or are pregnant. If you experience any severe or persistent side effects, seek medical attention immediately.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.goodrx.com/advil/advil-side-effects
[3] https://www.mayoclinic.org/drugs-supplements/ibuprofen-oral-route/side-effects/drg-20070602?p=1