The short version
Only one company currently supplies this market — there is no backup if it stumbles.
Market view
10 marketed package NDCs · 1 active manufacturer
Most dispensed: AZELASTINE HYDROCHLORIDE 205.5 ug · Spray, Metered · #22 cartons/bottle / 1 spray, metered in 1 carton
Only one company currently supplies this market — there is no backup if it stumbles.
Other molecules FDA puts in Histamine-1 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.