It may seem strange for a “philosopher” – or at least someone considered as such – to devote attention to the notion of medication and what lies beyond it, the corresponding discipline of pharmacodynamy. This problem should concern the physician and none other, as he is responsible for prescribing and understanding those substances that are liable to cure. But already what complicates the examination and keeps philosophy away from this field of possible reflection is the fact that medication today has partly deserted medicine for chemical industry, which defines it, renews it and produces it.