Below are the main rubriks (i.e strongest indications or symptoms) of Merc Viv in traditional homeopathic usage, not reviewed by the FDA.
Burning in the chest, extending to the throat.
Mercurius Vivus acts on lower part of right lung; stitches through to back.
Rush of blood to the chest.
Stitches in the chest, through, from the right scapula; pneumonia, with bilious symptoms.
Sensation of dryness in the chest.
Suppuration of the lungs after hemorrhages or after pneumonia.
Short-breathed on ascending or walking.
Asthma, from fumes of Arsenicum Album arsenic; better from tobacco smoke and in the cold air.
Dyspnoea (sensation of spasmodic contraction when coughing or sneezing).
Heart and pulse
Weakness at the heart, as if life was ebbing away; awakens with trembling at the heart, and agitation as if frightened.
Palpitation, with fear; worse at night.
Pulse full and accelerated, with erethism; frequent at night, slower by day, when slow it is weak and trembling; imperceptible, with warmth of the body.
Orgasm, with trembling from slight exertion.≡ more ...