℞ Zinci sulphatis,
Potassii sulphureti, ................āā........... ʒss-ʒiv
Aquæ, ............................................ ℥iv. M.
(The salts should be dissolved separately and then mixed; reaction takes place and the resulting lotion, when shaken, is milky in appearance, and free from odor; allowed to stand the particles settle, the sediment constituting about one-fourth to three-fourths of the whole bulk).
At times the addition to this formula of several drachms of alcohol and of five to ten minims of glycerin is of advantage.
An external remedy, often valuable, is ichthyol. It is thus prescribed:—
℞ Ichthyol, ........................................ ʒss-ʒj
Cerat. simp., .................................... ʒiv. M.
The various mercurial ointments, especially one of white precipitate, five to fifteen per cent. strength, are sometimes beneficial.
A compound lotion, containing mercury, which frequently proves serviceable, is:—
℞ Hydrarg. chlorid. corros., ....................... gr. ii-viij
Zinci sulphatis, ................................. gr. x-xx
Tinct. benzoini, ................................ fʒij
Aquæ, ................... q.s. ad. .............. f℥iv.
In extremely sluggish cases the following, used cautiously, is of value:—
℞ Ichthyol,
Saponis viridis,
Sulphur, præcip.,
Lanolin, .......................āā................ ʒj.