The short version
10 companies supply this market — deep enough that no single failure threatens the supply. The price has held steady around $0.6802 per unit over the past year. It is in shortage right now — FDA lists the reason as “discontinuation of the manufacture of the drug”. Put together: this looks like a healthy supply — the boring kind, which is exactly what you want.
The numbers behind every sentence are on this page below — and the Watch button emails you when any of them move.