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 citrate of ammonium and bismuth, 8 fluidounces.
Elixir of pepsin, 8 fluidounces.
Mix them together, and if of acid reaction, cautiously add ammonia water until it is neutral or slightly alkaline.
Each fluidrachm (teaspoonful) of the finished elixir contains one grain each of pepsin and citrate of ammonium and bismuth.
This preparation, we believe, is indebted for its value to the bismuth salt and alcohol. We doubt if the pepsin retains any of its digestive power, and in connection with the subject we direct attention to our remarks concerning pepsin.