The short version
11 companies supply this market — deep enough that no single failure threatens the supply. The generic price is up 13% over the past year, to $22.85 per mL. The brand runs $52.33 per mL — 2.3× more. Historically, drugs in this position went on to a new shortage within 90 days about 0.5% of the time — roughly 3× the typical drug (0.1%).