An astonishingly awful (so bad that the instructions actually recommend mixing it with honey to try to kill the taste) tasting cough syrup made by the W.K. Buckley company in Mississauga, Ontario.

Created by pharmacist William Knapp Buckley in 1919 the ingredients are:

Active ingredients (per teaspoon): Ammonium Carbonate 153 mg, Potassium Bicarbonate 267 mg, Menthol 22mg, Camphor 2.2 mg.
Non-Medicinal Ingredients: Canada Balsam, Carrageenan, Glycerin, Pine Needle Oil, Sodium Cyclamate (used as a sweetener), Tincture of Capsicum and Water. Contains Sodium Butylparaben, Sodium Propylparaben as preservatives.
Ick! No wonder it tastes so bad!

Their slogan is It tastes awful. And it works. Truth in advertising folks.