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Ionis Won The FDA Battle—But Its Real Billion-Dollar Test Is Just Beginning!

Ionis Pharmaceuticals has added another major regulatory win to its growing list of RNA-based medicines, with the FDA approving Zanvastro for adults and children with Alexander disease, a devastating neurological disorder that previously had no disease-modifying treatment. The approval is medically significant, but the muted stock reaction highlights an important divide between scientific achievement and commercial impact. Alexander disease affects an exceptionally small population, limiting Zanvastro’s likely revenue contribution even if adoption is strong. The much bigger financial test is TRYNGOLZA, whose recent expansion into severe hypertriglyceridemia, or sHTG, gives Ionis access to a market measured in millions rather than hundreds of patients. Management projects TRYNGOLZA could eventually exceed $3 billion in annual peak sales, but reaching that level will depend on physician adoption, reimbursement, competitive positioning and Ionis’ ability to turn its expanding pipeline into a sustainable commercial business.