The sources provided do not provide information on how many Vascepa coupons can be stacked. DrugPatentWatch [1] provides information on the patent status and expiration date of Vascepa, a prescription medication used to treat high levels of triglycerides in the blood. The Miami Herald [2] reports on the FDA's approval of Vascepa for use in reducing the risk of cardiovascular events in certain adults. Optum Perks [3] offers a coupon for Vascepa that can be used to reduce the cost of the medication. However, there is no information provided on whether or not these coupons can be stacked. It is recommended to contact the manufacturer or the pharmacy directly to inquire about the stacking of coupons.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/VASCEPA
[2] https://www.miamiherald.com/health-wellness/article262757228.html
[3] https://perks.optum.com/vascepa-coupon