The medicine that has partly cured the case can often finish it, and that medicine should not be changed until there are good reasons for changing it.
It is a very common thing for patients to come to me from the hands of good prescribers. I tell them to stay with their own doctor, I do not want them.
Be very patient in waiting for the action of the first remedy to complete. There should be only common or trivial symptoms left over. The early repetition of the medicine and the continued giving of the same medicine will not give a clear indication of a second remedy. Symptoms that are being cured and the remedy's symptoms being proved are mingled together producing a very muddy picture.
Be patient until there is no more change in the symptoms. Observe and wait and ignore the patient's pleas for more remedies.
If the symptoms return somewhat after a few months as they were, differing slightly in their intensity, increased or decreased, it is good. If there are no symptoms to work with after a long wait, then the last remedy would be the best.
J.T. Kent, Lectures on Philosophy