This section is from the "Elixirs And Flavoring Extracts. Their History, Formulae, & Methods of Preparation" book, by John Uri Lloyd. Also available from Amazon: Elixirs and flavoring extracts,: Their history, formulae, and methods of preparation;
Elixir of pepsin and ammonio citrate of bismuth, . 8 fluidounces.
Elixir of phosphate of quinine, 8 fluidounces.
Mix them together, and neutralize very carefully by means of acetic acid or ammonia water.
Each fluidrachm (teaspoonful) of the finished elixir contains one-half grain each of saccharated pepsin, ammonio-citrate of bismuth, and phosphate of quinine. This elixir should be discarded, as it is uncertain, unstable, and made of incompatibles.