Antacid active ingredients.

(a) The active antacid ingredients of the product consist of one or more of the ingredients permitted in § 331.11 within any maximum daily dosage limit established, each ingredient is included at a level that contributes at least 25 percent of the total acid neutralizing capacity of the product, and the finished product contains at least 5 meq of acid neutralizing capacity as measured by the procedure provided in the United States Pharmacopeia 23/National Formulary 18. The method established in § 331.20 shall be used to determine the percent contribution of each antacid active ingredient. (b) This section does not apply to an antacid ingredient specifically added as a corrective to prevent a laxative or constipating effect. [39 FR 19874, June 4, 1974, as amended at 61 FR 4822, Feb. 8, 1996]