The short version
Only one company currently supplies this market — there is no backup if it stumbles. The brand price is down 24% over the past year, to $10.62 per mL. Generic versions run $0.5857 per mL — 18× cheaper. Put together: worth watching — several of the pressures that precede supply trouble are present at once.
The numbers behind every sentence are on this page below — and the Watch button emails you when any of them move.