Fluid extract of guarana, 3 fluidounces.

Simple elixir, 13 fluidounces

Carbonate of magnesium, a sufficient quantity.

Triturate the fluid extract of guarana in a capacious mortar with carbonate of magnesium in amount sufficient to form a creamy mixture, then gradually add the simple elixir, stirring well, and filter. Lastly, mix the filtrate with the alcohol.

Each fluidrachm (teaspoonful) of the finished elixir represents seven and one-half minims of fluid extract of guarana, and is essentially the same as that recommended by the American Pharmaceutical Association, 1875. In the same year Mr. George W. Kennedy, through the American Journal of Pharmacy, gave a formula for this elixir, each fluidrachm of which represented fifteen grains of guarana.

The National Formulary authorizes the above proportion of guarana. In former editions of this work two fluidounces of the fluid extract were employed. Each fluidrachm represents about eleven grains of guarana.