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.
The only preparation of bismuth used in medicine was for a long time the subnitrate; but the subcarbonate has been of late introduced as a substitute, and is now recognized in the U. S. Pharmacopoeia; and a preparation containing the citrate of the metal with ammonia has recently been introduced, with the advantage that it may be used in the liquid form; the others being insoluble. These three preparations will be treated of under the present heading.