The short version
14 companies supply this market — deep enough that no single failure threatens the supply.
Market view
19 marketed package NDCs · 14 active manufacturers
14 companies supply this market — deep enough that no single failure threatens the supply.
Other molecules FDA puts in Antiarrhythmic, 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.