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Essence of Materia Medica – page 85

HYOSCYAMUS NIGER (hyos.)
This remedy is commonly thought of ih the category of acute states, like Belladonna and Aconite, but it also has extremely wide usefulness in chronic conditions.
The mania in Hyos. has many similarities to that of the other remedies, but it is more passive in quality. The person is not as active, energetic, or violent. He is more pre-occupied with an internal state, sitting and muttering to himself, or talking to absent people, or to dead people. This is the kind of mania commonly seen in elderly senile patients—sitting alone, muttering about nonsense, picking at their clothes, oblivious to their surroun¬dings. Of course, when pushed, Hyos. can explode into violence like any of the other remedies, thus explaining the fact that it is listed in bold type in the Repertory for Violent.
The basic disturbance in Hyos., in all of its stages, is jealousy and suspicion. Jealousy seems to motivate much of the behav¬iour, including the occasional violent outbursts. This may begin with jealousy over his wife, or the suspicion that everyone at his job is talking about him behind his back. This state then grows to include more and more people, widening the circle of sus¬picion from intimates and colleagues, to acquaintances, and even¬tually to complete strangers. The result may eventually be a simple paranoid state in a person who is still within contact with reality, or it may become a florid paranoid schizophrenia. It may even include some cases of delirium tremens, full of suspicion, imagining insects crawling all over him, seeing people outside the window who want to kill him. Such paranoids are common in mental institutions nowadays, afraid of everyone, convinced that people are trying to poison them, refusing food and med¬icine because it is poisoned.
There is also an obsessive character to the Hyos. mental process. Again, it is as if the defences of the organism, when confronted with the rising insanity, choose to compensate by causing the mind to become stuck in a rut, to become obsessive over simple and relatively harmless things. Kent’s description is best on this: