The short version
Just 2 companies supply this market — thin enough that a single exit would be felt immediately.
Market view
2 marketed package NDCs · 2 active manufacturers
Most dispensed: 10 mg · Tablet · #10 tablets/carton · 10 mg · Tablet · #4 tablets/carton · 10 mg · Tablet · #5 tablets/carton · 10 mg · Tablet · #6 tablets/carton
Just 2 companies supply this market — thin enough that a single exit would be felt immediately.
Other molecules FDA puts in Purine Antimetabolite, with whether each is in shortage right now. Same class is not the same drug — substitution is a clinical decision, and this is a supply picture, not a recommendation.
Expand a strength to see its dosage forms, then package sizes, then each manufacturer and NDC. Click an NDC for its full detail page.