Classification Nuance. The OpenFDA dataset, which draws from the Structured Product Labeling (SPL) files, often includes multiple classification fields, and the specific string "Phosphate Binder [EPC]" may only be assigned to a single product. The other drugs are likely classified using: More Specific Classes: Many of those drugs (like sevelamer, ferric citrate, etc.) may be classified by their specific mechanism or chemical group, which also acts as a phosphate binder. Example: A drug might be classified as "Iron-Containing Compound [EPC]" or "Aluminum-Containing Compound [EPC]" instead of the more general "Phosphate Binder [EPC]". Different Classification Fields: The NDC data contains several classification fields. You might be checking the Established Pharmacological Class (pharm_class_epc), but the other drugs might be listed under: Mechanism of Action (pharm_class_moa), Physiological Effect (pharm_class_pe)
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Cystic Fibrosis Transmembrane Conductance Regulator Potentiator [EPC]

NDC Number Brand Name Generic Name Manufacturer Dosage Form DEA Sch. Marketing Start Date
51167-121 ALYFTREK vanzacaftor, tezacaftor, and deutivacaftor Vertex Pharmaceuticals Incorporated TABLET, FILM COATED 2024-12-20
51167-122 ORKAMBI lumacaftor and ivacaftor Vertex Pharmaceuticals Incorporated GRANULE 2022-09-02
51167-135 ALYFTREK vanzacaftor, tezacaftor, and deutivacaftor Vertex Pharmaceuticals Incorporated TABLET, FILM COATED 2024-12-20
51167-200 Kalydeco ivacaftor Vertex Pharmaceuticals Incorporated TABLET, FILM COATED 2012-01-31
51167-300 Kalydeco ivacaftor Vertex Pharmaceuticals Incorporated GRANULE 2015-03-23
51167-400 Kalydeco ivacaftor Vertex Pharmaceuticals Incorporated GRANULE 2015-03-23
51167-500 ORKAMBI lumacaftor and ivacaftor Vertex Pharmaceuticals Incorporated GRANULE 2018-08-07
51167-600 Kalydeco ivacaftor Vertex Pharmaceuticals Incorporated GRANULE 2019-04-29
51167-700 ORKAMBI lumacaftor and ivacaftor Vertex Pharmaceuticals Incorporated TABLET, FILM COATED 2016-09-28
51167-770 Kalydeco ivacaftor Vertex Pharmaceuticals Incorporated GRANULE 2023-05-03
51167-785 Kalydeco ivacaftor Vertex Pharmaceuticals Incorporated GRANULE 2023-05-03
51167-809 ORKAMBI lumacaftor and ivacaftor Vertex Pharmaceuticals Incorporated TABLET, FILM COATED 2015-07-02
51167-900 ORKAMBI lumacaftor and ivacaftor Vertex Pharmaceuticals Incorporated GRANULE 2018-08-07



 [EPC] Established Pharmacological Classification 

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