Vascepa is a prescription medication used to treat high levels of triglycerides in the blood. While allergic reactions are possible with any medication, there is no mention of allergic reactions in the drug patent watch [1] or the FDA label [3] for Vascepa. However, according to Healthline [2], common side effects of Vascepa include joint pain, swelling, and redness, as well as gastrointestinal issues such as nausea, diarrhea, and upset stomach. In rare cases, more severe side effects such as liver problems, pancreatitis, and an allergic reaction may occur. Symptoms of an allergic reaction may include difficulty breathing, swelling of the face, lips, tongue, or throat, and hives. If you experience any of these symptoms, seek medical attention immediately. As with any medication, it is important to discuss any concerns or potential side effects with your healthcare provider before starting treatment with Vascepa.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/VASCEPA
[2] https://www.healthline.com/health/drugs/vascepa-side-effects
[3] https://www.accessdata.fda.gov/drugsatfda_docs/label/2019/202057s035lbl.pdf