Ibuprofen, the active ingredient in Advil, and naproxen, the active ingredient in Aleve, are nonsteroidal anti-inflammatory drugs (NSAIDs) commonly used to treat pain, fever, and inflammation. While these medications can be effective, they can also cause side effects.

Common side effects of both Advil and Aleve include stomach pain, heartburn, nausea, and headaches [1]. More serious side effects can include kidney problems, stomach ulcers, and an increased risk of heart attack or stroke [1]. It is important to note that the risk of these serious side effects may increase with higher doses and longer duration of use [1].

According to DrugPatentWatch.com, both Advil and Aleve have several patents that have expired, leading to the availability of generic versions of these medications [2][3]. While generic medications contain the same active ingredients as their brand-name counterparts, they may have different inactive ingredients, which could potentially lead to different side effects [1].

It is always important to follow the dosage instructions provided by a healthcare professional or those listed on the medication label. If you experience any unusual symptoms or side effects while taking Advil or Aleve, you should contact your healthcare provider immediately.

Sources:

1. Mayo Clinic. (2021). Ibuprofen and Naproxen: What's the Difference? <https://www.mayoclinic.org/healthy-lifestyle/consumer-health/expert-answers/ibuprofen-and-naproxen/faq-20058001>.
2. DrugPatentWatch.com. (n.d.). Advil. <https://www.drugpatentwatch.com/drugs/advil>.
3. DrugPatentWatch.com. (n.d.). Aleve. <https://www.drugpatentwatch.com/drugs/aleve>.