Materia Medica by Allen
(merc-cy)CYANIDE OF MERCURY
Malignant diphtheria with INTENSE REDNESS OF FAUCES and great difficulty of swallowing; pseudo-membranous formation extends all over fauces and down throat; putrid, gangrenous diphtheria, with phagedenic ulceration; membranous croup.
GREAT WEAKNESS; EXTREME PROSTRATION; cannot stand up from weakness.
When it corresponds to the genus epidemicus, like every other remedy, is effective as a prophylactic.