Medicated syrups are aqueous solutions containing sugar and at least one water soluble active ingredient.

The sugar is mainly used to:

  • Preserve the finished product.
  • Aid in masking the unpleasant taste of the active ingredient(s).
  • Enhance the flavour.

The concentration of sugar must approach but not quite reach the super-saturation point: the sugar concentration should be between 65 and 67% in weight. A lower percentage of sugar makes the syrup an excellent nutriment for yeast and other microorganisms. A sugar saturated syrup lead to crystallization of a part of the sugar under conditions of changing temperature.

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