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Materia Medica Viva Volume 10 – page 2093

• Amelioration after the flow of menses: starts stronger with Lachesis
• Loquacity; more for Lachesis, but both have mumbling, misplaced words.
• Fear of people; extreme suspicion and mistrust: more in Crotalus, less in Lachesis.
• Sexuality; easily over-excited for both, but Crotalus has no potency. Lachesis has a lot, is driven to masturbation.
• Cold skin; where Crotalus is cold and dry, Lachesis is cold and damp.
• One-sided affections; Crotalus is right-sided, Lachesis left-sided.
Generalities
The extreme action upon the blood is the most striking feature of this snake venom. Crotalus has a tendency to bleeding from all orifices of the body, from the eyes, the ears, the nose, the gums, the anus, the urethra; even haemorrhages from the teeth and under the nails; ‘…sometimes great quantities of blood come to the surface of the body, in the form of sweat’.
The remedy has been prescribed in yellow fever and blackwater fever, with its ominous black vomit and tarry stools; in gastric ulcers with ‘coffee-grounds’ vomit; in persistent and profuse epistaxis with much prostration as happens, for example, in cases of diphtheria. There is also bleeding of the skin, in the form of petechiae and ecchymoses, purpura, suffusion, with black and blue spots; blue and especially yellow discolouration of the skin may indicate Crotalus.