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Materia Medica Viva Volume 3 – page 699

ATROPINUM
Atropine, an alkaloid of Belladona.
Cl7 H23 N03.
The effects of the Sulphate of Atropine, the preparation most in use, are included.
THE ESSENTIAL FEATURES
Atropinum is a remedy that deserves closer study by homeopaths, as it will be found to correspond to several uncurable conditions.
It will probably not be needed as frequently as Belladona, but should be used much more frequently than it is presently. A general rule for its use should be to give Atropinum before trying any other medicine whenever you have a case that looks like Belladona but where this remedy does not act. We can say that Atropinum is a neurotropic remedy, though it does not exclusively affect the nervous system. It is one of the first remedies in cases where we have convulsions or violent tremblings coupled with delirium and dryness of the mouth. Meningitis, meningoencephalitis or similar conditions, where the pathology seems to be centered very much on the nervous system.
Atropine, as the most active principle in Belladona, produces quite a number of its symptoms, but at the same time the two are not identical. Atropine, as we have said, has a predominent action on the nervous system, both central and peripheral, but does not have the degree of suddenness of Belladona. Moreover, the acuteness, the stormy and devastating character of Belladona and its excessive congestion are also absent. The plant seems to contain substances that accentuate the action of the active principle in Belladona and give it its sudden, congestive and devastating character.
Atropine affects the deeper regions and eclectively the nervous system.
Apart from the nervous and psychopathic diseases, Atropine is also indicated in states that remind one, so to speak, of the "after effects" of Belladona symptomatology. Examples include cases where a cold develops into a severe sinusitis; or where an influenza has developed into an exasperating dry spasmodic coughing; where violent laryngeal catarrh leaves an irritable condition; where every change of temperature,