The short version
6 companies supply this market — a reasonable cushion if one runs into trouble.
Market view
19 marketed package NDCs · 6 active manufacturers
Most dispensed: 100 ug/5mL · Injection, Powder, Lyophilized, For Solution · #1 vial, single-dose/carton / 5 ml in 1 vial, single-dose · 500 ug/5mL · Injection, Powder, Lyophilized, For Solution · #1 vial, single-dose/carton / 5 ml in 1 vial, single-dose · 200 ug/5mL · Injection, Powder, Lyophilized, For Solution · #1 vial, single-dose/carton / 5 ml in 1 vial, single-dose
6 companies supply this market — a reasonable cushion if one runs into trouble.
Other molecules FDA puts in l-Thyroxine, 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.