{"data":{"id":"us/21-cfr-358.303","jurisdiction":"us","citation":"21 CFR 358.303","heading":"Definitions.","body":"As used in this subpart:\n(a) Ingrown toenail relief drug product. A drug product applied to an ingrown toenail that relieves pain or discomfort either by softening the nail or by hardening the nail bed.\n(b) Retainer ring. A die cut polyethylene foam pad coated on one side with medical grade acrylic pressure-sensitive adhesive. The retainer ring has slots, center-cut completely through the foam with the cut of sufficient size to allow for localization of an active ingredient in a gel vehicle to a specific target area. The retainer ring is used with adhesive bandage strips to place over the retainer ring to hold it in place.","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 358—MISCELLANEOUS EXTERNAL DRUG PRODUCTS FOR OVER-THE-COUNTER HUMAN USE","Subpart D—Ingrown Toenail Relief Drug Products"],"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":"e5c5d901ccf18586ac661a9e3423aff292e25bc08cccd44d5e3c196e06f70ffe","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-358.301","next":"us/21-cfr-358.310"},"notice":"GroundRules: Original legal text. Not legal advice."}