Below are the main rubriks (i.e strongest indications or symptoms) of Corallium Rubrum in traditional homeopathic usage, not approved by the FDA.
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Is useful for spasmodic cough, like whooping cough. It is continual, short, hawking through the day, so constant and frequent as to have merited the description given it of "Minute Gun Powder gun" cough. This is during the day and there is not much whooping, but at night there is more whooping. The night paroxysms are sometimes very severe.
I have found Coral. one of the very best remedies for post nasal catarrh, with mutch dropping of mucus into the throat. (Natrum carb.) I do not know any other remedy so efficacious in the majority of cases, and generally prescribe it, unless I have strong indications for some other remedy. I seldom fail to hear a good report from it. Coral. has also been found useful in chancre. The ulcer is red (coral red), flat and exceedingly sensitive, sometimes painful. Chancroids or soft chancre, for which the old school cauterize, may find a swift and sure cure in Coral.