This section is from the book "A Treatise On Therapeutics, And Pharmacology Or Materia Medica Vol1", by George B. Wood. Also available from Amazon: Part 1 and Part 2.
Another syrup proposed by Soubeiran contains the pyrophosphate of iron. A formula for it is contained in the V. S. Dispensatory (12th ed., p. 1144). A preparation essentially like it may be made by dissolving the pyrophosphate of iron of the U. S. Pharmacopoeia in a little water, and mixing the solution with syrup.
A compound syrup of phosphate of iron, called chemical food, from the circumstance that it contains many of the mineral constituents of the system, which may be supposed to contribute in this form to its nourishment and support, has been much used in general practice, without having yet obtained officinal sanction. A formula for its preparation will be found in the U. S. Dispensatory (12th ed., p. 1143). It la very doubtful whether any material advantage can be obtained from it which may not be obtained from the simple syrup, with such additions as the wants of the system may at any time require; while many of its ingredients must generally be quite superfluous, as the system seldom needs the whole.
The dose of the British syrup is one or two fluidrachms, each containing 3.5 grains of phosphate of iron. By dissolving half a drachm of the U. S. pyrophosphate in a fluidounce of syrup, an equivalent preparation may be made, of which a fluidrachm would be a medium dose.