Vascepa is a prescription drug that is used to treat high triglyceride levels in the blood. The drug's active ingredient is icosapent ethyl, and it was first approved by the FDA in 2012 [1]. While there are now several generic versions of Vascepa available, they have not captured a significant market share.

One reason for this may be the high cost of the drug. According to a report by the Department of Health and Human Services, the cost of generic drugs can vary widely depending on the manufacturer, and some generics may be more expensive than the brand-name drug [3]. In the case of Vascepa, the brand-name drug is still priced relatively high, and some generic versions may not offer significant cost savings.

Another factor that may be contributing to the limited market share of Vascepa generics is competition from other drugs. While Vascepa is effective at lowering triglyceride levels, there are other drugs on the market that can also achieve this goal. For example, fenofibrate and gemfibrozil are both generic drugs that are used to treat high triglyceride levels [2].

Finally, it's worth noting that the generic drug market is highly competitive, and there are many factors that can influence which drugs capture the most market share. Factors such as marketing, distribution, and availability can all play a role in determining which drugs are most successful [2].

In conclusion, while there are several generic versions of Vascepa available, they have not captured a significant market share. This may be due to the high cost of the drug, competition from other drugs, and other factors that influence the generic drug market.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/VASCEPA
[2] https://www.fiercepharma.com/pharma/top-10-generic-drugmakers-2021-revenue
[3] https://aspe.hhs.gov/sites/default/files/documents/20e14b66420440b9e726c61d281cc5a5/cost-of-generic-drugs-erg.pdf