Plozasiran (Redemplo – Arrowhead), an apolipoprotein C-III (apoC-III)-directed small interfering ribonucleic acid (siRNA), has been approved by the FDA to reduce triglyceride levels in adults with familial chylomicronemia syndrome (FCS). It is the second drug to be approved in the US for this indication; the apoC-III-directed antisense oligonucleotide olezarsen (Tryngolza) was approved in 2024.