StacksVerified U.S. regulatory reference

21 CFR §358.503

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
As used in this subpart:
  1. (a)Corn and callus remover drug product. A topical agent used for the removal of corns and calluses.
  2. (b)Collodion-like vehicle. A solution containing pyroxylin (nitrocellulose) in an appropriate nonaqueous solvent that leaves a transparent cohesive film when applied to the skin in a thin layer.
  3. (c)Plaster vehicle. A fabric, plastic, or other suitable backing material in which medication is usually incorporated for topical application to the skin.