Prostacyclin (or PGI2) is a member of the family of lipid molecules known as eicosanoids.\nAs a drug, it is also known as "epoprostenol".[1] The terms are sometimes used interchangeably
Prostacyclin (PGI2) chiefly prevents formation of the platelet plug involved in primary hemostasis (a part of blood clot formation). It is also an effective vasodilator. Prostacyclin's interactions in contrast to thromboxane (TXA2), another eicosanoid, strongly suggest a mechanism of cardiovascular homeostasis between the two hormones in relation to vascular damage.