Below are the main rubriks (i.e strongest indications or symptoms) of Mercurius Corrosivus in traditional homeopathic usage, not approved by the FDA.
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RECTUM, ANUS, STOOL
Stools yellow, green, bilious, followed by slime and blood; with tenesmus and insupportable cutting colicky pains; after stool, burning and tenesmus of rectum and bladder; worse in fall; worse after midnight.
Painful bloody discharges, with vomiting.
Constipation.≡ more ...