The short version
13 companies supply this market — deep enough that no single failure threatens the supply. The generic price is up 28% over the past year, to $2.37 per unit. The brand runs $3.79 per unit — 1.6× more. Historically, drugs in this position went on to a new shortage within 90 days about 0.7% of the time — roughly 4× the typical drug (0.1%).