1864 Cough remedy

Here's an interesting recipe I found in the 1864 Pacific Medical and Surgical Journal (Volume 7, page 154):

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For Coughs
Tronchin's Cough Syrup

Rx  Powdered gum arabic........................8 ounces
.......Precipitated sulpheret of anatomy.......4 scruples
.......Anise...................................4 scruples
.......Abstract of Liquorice...................2 ounces
.......Extract of Opium........................12 grains
.......White sugar.............................2 pounds
Mix and form lozanges of six grains, one of which isto be taken occasionally in catarrh and bronchial affections.

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I just though it was interesting the use of opium in cough syrup, and how nice a remedy that would be for a simple cough.