The short version
Just 2 companies supply this market — thin enough that a single exit would be felt immediately.
Market view
10 marketed package NDCs · 2 active manufacturers
Most dispensed: 675 mg; 135 mg · Tablet, Chewable · #3 packages/cello pack / 10 tablet, chewable in 1 package · 675 mg; 135 mg · Tablet, Chewable · #96 tablet, chewables/bottle, plastic
Just 2 companies supply this market — thin enough that a single exit would be felt immediately.
Other molecules FDA puts in Phosphate Binder, 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.