Below are the main rubriks (i.e strongest indications or symptoms) of Merc Viv in traditional homeopathic usage, not approved by the FDA.
Quicksilver. Hahnemann. The Element.
Violent. racking. worse at night, as if the head and chest would burst, sometimes with vomiturition.
in two paroxysms, from tickling in the larynx and upper part of the chest.
only at night or only by day.
with acrid, yellowish mucus, at times mixed with coagulated blood and tasting putrid or saltish.
with shortness of breath and salivation.
but allowing him to utter an audible word.
worse at night, in the night air, when lying on either side.