(Note: This section is wholly re-written in the sixth edition.)
The dose of the same medicine may be repeated several times according to circumstances, but only so long as until either recovery ensues, or the same remedy ceases to do good and the rest of the disease, presenting a different group of symptoms, demands a different homoeopathic remedy. (Note: Before making such a repetition of the dose the physician must of course be convinced that his selection is truly homoeopathic.)
In acute diseases, the time for repeating the fitly chosen medicine is regulated by the greater or less rapidity of the course of the disease we have to combat, so that, when necessary, it should be repeated after twenty-four, sixteen, twelve, eight, four and even fewer hours, if the medicine continue to prove beneficial without interruption without producing new symptoms but it is not sufficiently rapid in its action for the excessively quick and dangerous course of the acute diseases, so that in cholera the most speedily fatal disease we know, at the commencement of the disease, one or two drops of a mild solution of camphor must be given every five minutes, in order to procure speedy and certain relief, and in the more developed cholera, doses of cuprum, veratrum, phosphorus, &c. (X), frequently require to be given every two or three hours, and also arsenic, carbo-vegetabilis, &c, at similar short intervals.
In the treatment of so-called typhus fevers and other continued fevers, the repetition, in smallest doses, of the medicine that proves itself of service, must be regulated by the above directions. In pure syphilitic diseases I have generally found a single dose of metallic mercury (X) sufficient; and yet not infrequently two or three such doses were requisite, given intervals of six or eight days, when the slightest complication with psora was perceptible.).