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Essence of Materia Medica – page 198

Works best in very high potency—50 M, CM. Don’t expect it work quickly. May have to wait six months—a year for any action to develop. (Silica also slow to act).
Suppressed syphilis will produce alcoholism, also a super-ego.
Causticum is more direct, and if wakes and thinks has left door open will get up immediately to close it. Syphilinum will lie and think something is going to happen before getting up to check it.