Icosapent ethyl is a prescription medication used to reduce triglyceride levels in the blood. Common side effects of icosapent ethyl may include joint pain, swelling of the extremities, and muscle aches. Serious side effects may include an allergic reaction, irregular heartbeat, and pancreatitis. It is important to consult a healthcare provider for a complete list of side effects and to discuss any concerns or questions about taking this medication [2][3].

Sources:
- [1] https://www.drugpatentwatch.com/p/tradename/ICOSAPENT
- [2] https://www.mayoclinic.org/drugs-supplements/icosapent-ethyl-oral-route/side-effects/drg-20075707
- [3] https://medlineplus.gov/druginfo/meds/a613024.html