{"data":{"id":"us/21-cfr-338.10","jurisdiction":"us","citation":"21 CFR 338.10","heading":"Nighttime sleep-aid active ingredients.","body":"The active ingredient of the product consists of any of the following when used within the dosage limits established for each ingredient in § 338.50(d):\n(a) Diphenhydramine hydrochloride.\n(b) Diphenhydramine citrate.","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 338—NIGHTTIME SLEEP-AID DRUG PRODUCTS FOR OVER-THE-COUNTER 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":"468e0991de4ddfae000b4323c72bfd80ded33b3c32189629fc28941ece49f46e","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-338.3","next":"us/21-cfr-338.50"},"notice":"GroundRules: Original legal text. Not legal advice."}