Vascepa is a prescription medication used to reduce high levels of triglycerides in adults. According to the sources provided, the most common side effects of Vascepa are joint pain, swelling in the hands or feet, and a sore throat [1][2][3]. Other side effects that may occur include back pain, constipation, diarrhea, dizziness, headache, nausea, and muscle pain [1][2][3]. In rare cases, Vascepa may cause serious side effects such as an allergic reaction, bleeding, or pancreatitis [2][3]. Patients should seek immediate medical attention if they experience symptoms such as chest pain, difficulty breathing, severe stomach pain, or signs of an allergic reaction such as rash, itching, or swelling of the face, tongue, or throat [2][3]. It is important to note that this is not a complete list of side effects and patients should speak with their healthcare provider if they have any concerns about taking Vascepa [1][2][3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/VASCEPA
[2] https://www.everydayhealth.com/drugs/vascepa
[3] https://www.rxlist.com/vascepa-drug.htm