The short version
14 companies supply this market — deep enough that no single failure threatens the supply.
Market view
20 marketed package NDCs · 14 active manufacturers
Most dispensed: 10 mg · Tablet, Film Coated · #30 tablet, film coateds/bottle · 10 mg · Tablet, Film Coated · #1 bottle/carton / 30 tablet, film coated in 1 bottle · 10 mg · Tablet, Film Coated · #1 blister pack/carton / 15 tablet, film coated in 1 blister pack
14 companies supply this market — deep enough that no single failure threatens the supply.
Other molecules FDA puts in Endothelin Receptor Antagonist, 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.