§ 32
But it is quite otherwise with the artificial morbific agents which we term medicines. Every real medicine, namely, acts at all times, under all circumstances, on every living human being, and produces in him its peculiar symptoms (distinctly perceptible, if the dose be large enough), so that evidently every living human organism is liable to be affected, and, as it were, inoculated with the medicinal disease at all times, and absolutely (unconditionally), which, as before said, is by no means the case with the natural diseases.