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Biowaiver Monographs for Immediate-Release Solid Oral Dosage Forms: Nifedipine.

Literature data relevant to the biopharmaceutical properties of the active pharmaceutical ingredient (API) nifedipine are reviewed to evaluate whether a waiver of in vivo bioequivalence (BE) testing of immediate-release (IR) dosage forms formulated as tablets and soft gelatin capsules is warranted. Nifedipine's solubility and permeability, its therapeutic use and index, pharmacokinetics, food drug interactions, and any reported BE/bioavailability problems were all taken into consideration. Solubility and BA data indicate conclusively that nifedipine is a class II substance of biopharmaceutics classification system (BCS) and that the formulation of drug product plays a key role on the dissolution characteristics of the API. Therefore, a BCS biowaiver-based approval of nifedipine containing IR oral dosage forms cannot be recommended for reformulated/new multisource drug products or for major scale-up and postapproval changes to the existing drug products.

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