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Materia Medica Viva Volume 4 – page 986

Another key-note in this remedy is trembling in the left side of the lumbar region or in the loins.
Some conditions for which you may think of this remedy:
1. Fluctuation of symptoms according to the odour of the urine.
Due to an irregularity in the action of the kidneys, an increase in the pungency of the urine is accompanied by an amelioration of symptoms, and vice versa. The kidneys appear to function for a while, eliminating freely, in which case the urine is loaded with plenty of uric acid, full of deposits, dark in colour, profuse and strong smelling; these conditions are accompanied by minimised symptoms and an increase in the patient’s comfort. At other times the kidneys seem not to be able to perform their eliminating processes and the urine is scanty or of light specific gravity, coming out like clear water. In such a case the complaints of the patient are almost always aggravated.
This is not always the case however. Symptoms may appear and be aggravated with scanty, suppressed, and at the same time highly odorous urine.
2. Benzoic acid should be considered as well as Medorrhinum in cases with a history of suppressed gonorrhea, with complaints now mostly in the joints but with a tendency to affect the heart as well. In most of these cases where there is an aggravation from weather changes, from cold drafts and cold air, and amelioration from heat and warm covering, the usual prescription of Rhus toxicodendron seldom does any good, and Medorrhinum also often fails. Benzoic acid should be thought of especially if the pains change place suddenly and constantly, from the extremities to the heart and vice-versa, while staying mainly about the heart. It is interesting to note