Prostaglandins (PGs) are naturally-occurring fatty acids synthesised from arachidonic acid by cyclo-oxygenase enzymes. Two PGs with circulatory actions, alprostadil (PGE1; Prostin VR - Upjohn) and epoprostenol (prostacyclin, PGI2; Flolan - Wellcome, Cyclo-Prostin - Upjohn) are marketed in Britain. Both have already found a place; alprostadil for neonates with congenital heart disease, epoprostenol for use in extracorporeal circulations and in patients with severe peripheral vascular disease.
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