{"data":{"id":"us/21-cfr-331.10","jurisdiction":"us","citation":"21 CFR 331.10","heading":"Antacid active ingredients.","body":"(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.\n(b) This section does not apply to an antacid ingredient specifically added as a corrective to prevent a laxative or constipating effect.","path":["Title 21—Food and Drugs","CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES","SUBCHAPTER D—DRUGS FOR HUMAN USE","PART 331—ANTACID PRODUCTS FOR OVER-THE-COUNTER (OTC) HUMAN USE","Subpart B—Active Ingredients"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-21.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:47Z","sha256":"d32ac6b39b882fc01d68e8fec0e630115bfe0984041c0d6d504386cc248f3f4e","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-331.1","next":"us/21-cfr-331.11"},"notice":"GroundRules: Original legal text. Not legal advice."}