Dihydroxyaluminum Sodium Carbonate Chewable Tablets

This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition

Issued and maintained by the United States Pharmacopeial Convention (USP)

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Former title: Dihydroxyaluminum Sodium Carbonate Tablets 

Dihydroxyaluminum Sodium Carbonate Chewable Tablets contain not less than 90.0 percent and not more than 110.0 percent of the labeled amount of CH₂AlNaO₅. 

1 Packaging and storage—

Preserve in well-closed containers. 

2 Labeling—

Label the Chewable Tablets to indicate that they are to be chewed before swallowing. 

3 Identication—

A 1 in 10 suspension of powdered Chewable Tablets in 3 N hydrochloric acid meets the requirements of the tests for Aluminum 〈191〉 and for Sodium 〈191〉. 

Uniformity of dosage units 〈905〉: meet the requirements. 

Acid-neutralizing capacity 〈301〉—Not less than 5 mEq of acid is consumed by the minimum single dose recommended in the labeling, and not less than the number of mEq calculated by the formula: 

0.8(0.0278D) 

in which 0.0278 is the theoretical acid-neutralizing capacity, in mEq, of CH₂AlNaO₅, and D is the quantity, in mg, of CH₂AlNaO₅ in the specimen tested, based on the labeled quantity. 

4 Assay— 

Edetate disodium titrant—Dissolve 18.6 g of edetate disodium in water to make 500 mL, and standardize as directed in the Assay under Ammonium Alum. 

Procedure—Weigh and nely powder not fewer than 20 Chewable Tablets. Transfer an accurately weighed portion of the powder, equivalent to about 300 mg of dihydroxyaluminum sodium carbonate, to a 250-mL beaker, and proceed as directed in the Assay under Dihydroxyaluminum Sodium Carbonate, beginning with “add 10 mL of 2 N sulfuric acid.” Each mL of 0.1 M Edetate disodium titrant is equivalent to 14.40 mg of CH₂AlNaO₅.