The short version
Just 3 companies supply this market — thin enough that a single exit would be felt immediately. The price has jumped 123% in a year, to $1.73 per mL — sharp rises like this often mean supply is already tightening. It is in shortage right now — FDA lists the reason as “demand increase for the drug”. 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.