Page 307 - My FlipBook

SUBNITRATE OF BISMUTH. 305

The Subnitrate of Bismuth is obtained by dissolving the metal
bismuth in dilute nitric acid, and converting the nitrate thus
formed into carbonate, by adding a solution of carbonate of so-
dium, u^hich is then dissolved in nitric acid and the nitrate of bis-
muth again formed, which is vi^ashed in water and the nitric acid
removed by ammonia. Such a process frees it from the arsenious
acid which metallic bismuth generally contains. Subnitrate of
bismuth is in the form of a heavy, white powder, with a faint acid
odor and slightly metallic taste, and is soluble in water. Large
quantities are poisonous, with symptoms of arsenical poisoning.
Medical Properties and Action. — Subnitrate of bismuth is
sedative, astringent and alterative. Owing to the formation of a
sulphide, it coats the tongue black, and its continued use may
give rise to the formation of a bluish-red line on the gums,
similar to that resulting from the use of lead, except that the line
is wider and deeper in color. In proper doses, it promotes the
appetite and increases the digestive power. Being somewhat as-
tringent, it afFects the intestinal movements, and can be detected
in the blood, urine, and other secretions.
Therapeutic Uses.— -Subnitrate of bismuth is employed in
atonic dyspepsia, gastric irritations (milder forms), pyrosis, gas-
trodynia, ulcer of the stomach, diarrhoea from
debility, etc.
chronic laryngitis, epilepsy, ringworm (in form of an ointment
.5j to lard .5j), chronic skin diseases, chlorosis, when iron is not
tolerated, etc., etc. If not well borne by the stomach, it may
be combined with aromatic powder, or
if alkalies are indicated,
with chalk and xnagnesia.
Bismuthi subnitras is also employed as an antiseptic dressing
for wounds, to promote primary union.
The subnitrate is held
in suspension in water, in the proportion of lo per cent., and
during the operation the wound
is, from time to time, sprinkled
with the solution, and afterward sealed with a bismuth paste, and
the subsequent dressings made in the same manner.
Dose.—Of subnitrate of bismuth, grs. v-x to 5j, in powder or
emulsion.
Dental Uses.—Subnitrate of bismuth is a valuable internal
remedy in aphthae, mercurial salivation, painful ulcers of the
20