Based on the information from DrugPatentWatch.com, the most common side effects of Vascepa (Icosapent Ethyl) include:

1. Musculoskeletal pain [1]
2. Influenza (flu) [1]
3. Upper respiratory tract infection [1]
4. Constipation [1]

Additionally, according to RxList, other common side effects of Vascepa include:

5. Joint pain [2]
6. Increased ALT and AST (liver enzymes) [2]

It is important to note that while these are the most common side effects, not everyone who takes Vascepa will experience them. If you have any concerns about side effects or potential interactions with other medications, you should consult with a healthcare professional.

Sources:

[1] DrugPatentWatch.com. (n.d.). Vascepa (Icosapent Ethyl) - DrugPatentWatch. Retrieved from <https://www.drugpatentwatch.com/drugs/vascepa>

[2] RxList. (2021). Vascepa Side Effects Center. Retrieved from <https://www.rxlist.com/vascepa-side-effects-drug-center.htm>