Vascepa is a prescription medication that contains the active ingredient icosapent ethyl, which is a type of omega-3 fatty acid. According to the drug label [2], Vascepa is derived from fish oil, specifically the oil of the purified ester form of eicosapentaenoic acid (EPA). The label also states that Vascepa should not be taken by patients with a known hypersensitivity to any of its components, including fish and shellfish.

The drug patent information [1] confirms that Vascepa is derived from fish oil, and that it is used to reduce triglyceride levels in adults with severe hypertriglyceridemia. The patent information does not specifically mention shellfish, but the drug label's warning against taking Vascepa if one has a known hypersensitivity to shellfish suggests that shellfish may be a concern.

In summary, Vascepa is derived from fish oil and should not be taken by patients with a known hypersensitivity to fish or shellfish. Therefore, it is important for patients to disclose any allergies or sensitivities to their healthcare provider before taking Vascepa [2].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/VASCEPA
[2] https://www.accessdata.fda.gov/drugsatfda_docs/label/2017/202057s019lbl.pdf
[3] https://www.vascepa.com/about-vascepa/how-it-works/