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: 2 mg/10mL; DEXTROMETHORPHAN HYDROBROMIDE 15 mg/10mL · Liquid · #1 bottle/carton / 118 ml in 1 bottle
Just 3 companies supply this market — thin enough that a single exit would be felt immediately.
Other molecules FDA puts in Uncompetitive N-methyl-D-aspartate 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.