The short version
Just 3 companies supply this market — thin enough that a single exit would be felt immediately.
Market view
3 marketed package NDCs · 3 active manufacturers
Most dispensed: HEPATITIS B VIRUS SUBTYPE ADW HBSAG SURFACE PROTEIN ANTIGEN 20 ug/.5mL · Injection, Solution · #5 syringes/carton / .5 ml in 1 syringe
Just 3 companies supply this market — thin enough that a single exit would be felt immediately.
Other molecules FDA puts in Inactivated Hepatitis B Virus Vaccine, 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.