Alum: as gargle.

Ammonium Chloride: as spray.

Bismuth: locally by insufflation.

Ferric Chloride: as spray, or brushed on interior of larynx.

Gelsemium.

Glycerin.

Guaiacum: as lozenges or mixture.

Inhalation.

Iodine: as counter-irritant.

Mercury.