Advil, also known as ibuprofen, is a commonly used over-the-counter medication for pain relief and reducing inflammation. While it is generally considered safe when used as directed, like any medication, it can have side effects. Let's take a look at the sources you provided to understand the potential side effects of Advil.

According to the drug patent watch website [1], the most common side effects of Advil include stomach upset, heartburn, and nausea. These side effects are generally mild and temporary. However, if you experience severe stomach pain, black or bloody stools, or vomit that looks like coffee grounds, it could be a sign of a more serious condition and you should seek medical attention.

The GoodRx website [2] provides a more comprehensive list of potential side effects. It mentions that Advil may cause dizziness, headache, and nervousness. It can also lead to fluid retention, which may cause swelling in the hands, ankles, or feet. Some individuals may experience allergic reactions such as rash, itching, or swelling, particularly if they are allergic to other nonsteroidal anti-inflammatory drugs (NSAIDs).

The WebMD page [3] on Advil provides additional information on potential side effects. It notes that Advil may increase the risk of heart attack or stroke, especially when used for a prolonged period or in high doses. This risk may be higher in individuals with pre-existing heart conditions or those who have had heart bypass surgery. It is important to follow the recommended dosage and duration of use to minimize this risk.

Other less common side effects of Advil mentioned on the WebMD page include ringing in the ears, changes in vision, and signs of kidney problems such as changes in urine output or blood in the urine. It is advisable to consult a healthcare professional if you experience any of these symptoms.

In summary, while Advil is generally safe when used as directed, it can have side effects. The most common side effects include stomach upset, heartburn, and nausea. Other potential side effects include dizziness, fluid retention, allergic reactions, and an increased risk of heart attack or stroke. It is important to follow the recommended dosage and duration of use, and consult a healthcare professional if you experience any concerning symptoms.

Sources:
[1] Drug Patent Watch. Advil Side Effects. Retrieved from https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] GoodRx. Advil Side Effects. Retrieved from https://www.goodrx.com/advil/advil-side-effects
[3] WebMD. Advil Oral: Uses, Side Effects, Interactions, Pictures, Warnings & Dosing. Retrieved from https://www.webmd.com/drugs/2/drug-6143-9368/advil-oral/ibuprofen-oral/details