Vascepa is a prescription medication that contains the active ingredient icosapent ethyl. It is used to reduce the risk of cardiovascular events in adults with high triglyceride levels. According to Drugs.com [1], Vascepa starts working immediately after the first dose. However, it may take several weeks to see a noticeable improvement in triglyceride levels. The full effect of Vascepa may take up to 12 weeks to become evident.

The drug works by reducing the production of triglycerides in the liver and increasing the breakdown of existing triglycerides. It does not affect cholesterol levels or blood pressure [2].

It is important to note that Vascepa is not a cure for high triglycerides. It is intended to be used as part of a comprehensive treatment plan that includes a healthy diet, regular exercise, and other medications as prescribed by a doctor [3].

In conclusion, Vascepa starts working immediately after the first dose, but it may take several weeks to see a noticeable improvement in triglyceride levels. The full effect of Vascepa may take up to 12 weeks to become evident. It is important to use Vascepa as part of a comprehensive treatment plan that includes a healthy lifestyle and other medications as prescribed by a doctor.

Sources:
[1] https://www.drugs.com/medical-answers/long-vascepa-work-3553333/
[2] https://www.healthline.com/health/drugs/vascepa
[3] https://www.drugpatentwatch.com/p/tradename/VASCEPA