The short version
15 companies supply this market — deep enough that no single failure threatens the supply.
Market view
27 marketed package NDCs · 15 active manufacturers
Most dispensed: 30 mg · Tablet, Coated · #30 tablet, coateds/bottle, plastic · 1 kg/kg · Powder · #1 kg/drum · 25 kg/25kg · Powder · #10 kg/drum
15 companies supply this market — deep enough that no single failure threatens the supply.
Other molecules FDA puts in Calcium-sensing Receptor Agonist, 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.