331.10—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.