The short version
18 companies supply this market — deep enough that no single failure threatens the supply. The generic price is up 23% over the past year, to $0.1293 per unit. The brand runs $7.98 per unit — 62× more. Historically, drugs in this position went on to a new shortage within 90 days about 0.2% of the time — roughly 2× the typical drug (0.1%).