The short version
5 companies supply this market — a reasonable cushion if one runs into trouble. The generic price has fallen 31% in a year, to $4.39 per unit — and generics that get this cheap tend to get abandoned rather than defended. The brand (Nexium) runs $9.14 per unit — 2× more. 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.