Pepsin: as membrane solvent, locally.
Pilocarpine Hydrochlorate: internally; sometimes aids in loosening the false membrane.
Potassa Solution: internally.
Potassium Bichromate: as emetic.
Potassium Chlorate: internally, frequently repeated, and locally as a gargle.
Potassium Permanganate: as gargle.
Pyoktanin: topically.
Quinine: strong solution or spray.
Resorcin: spray.
Sanguinaria: as emetic. See under Croup.