Definitions.
21 C.F.R. § 358.303
in effectEffective: 2024-07-01As used in this subpart:
(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.
(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.
Source: eCFRURL: https://www.ecfr.gov/api/versioner/v1/full/2024-07-01/title-21.xmlFetched: 7/26/2026