This section is from the "A Handbook of Useful Drugs" book, by State Medical Examining and Licensing Boards.
A mixture of equal parts of caffein and citric acid.
Properties : Citrated caffein is a white odorless powder having a slightly bitter taste and an acid reaction. It is more readily soluble than the alkaloid but is not adapted for hypo-dermic use.
Dosage: 0.1 gm. or about 2 grains.