According to the prescribing information provided by the FDA [2], patients taking Vascepa should have their lipid levels checked every 4 to 8 weeks after starting treatment or changing the dose. The frequency of monitoring should then be individualized based on the patient's response to treatment and lipid levels. The drugpatentwatch website [1] provides information on the recommended dosage and administration of Vascepa, but does not mention specific monitoring recommendations. However, Medscape [3] notes that lipid levels should be monitored periodically during treatment with Vascepa. It is important for patients to follow their healthcare provider's instructions regarding monitoring and follow-up appointments.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/VASCEPA
[2] https://www.accessdata.fda.gov/drugsatfda_docs/label/2017/202057s019lbl.pdf
[3] https://reference.medscape.com/drug/vascepa-icosapent-999764