Type-level segmentation partitions the Transthyretin market into stabilizers, gene-silencers, and protein-reduction surgery, each carrying distinct pharmacoeconomic profiles. Stabilizers (tafamidis, diflunisal) currently hold the greatest share because once-daily oral dosing secures broad prescriber adoption and favorable adherence across both variant and wild-type cohorts; however, generic diflunisal erosion is compressing ASPs by 8โ10 % annually. Gene-silencing RNAi agents (patisiran, vutrisiran) command the highest per-kg cost, justified by halting neuropathy progression in polyneuropathy patients and creating durable payer value through avoided autonomic crises, but penetration is capped by infusion-center capacity and prior-authorization hurdles. Orthotopic liver transplant, though the only curative modality, is now a low-double-digit share segment limited by organ availability and long-term immunosuppression costs. Together, these categories illustrate how mechanism-aligned Transthyretin segmentation determines both headline revenue and access dynamics across geographies.