The development of potencies and repetition in Hahnemann's last years: literature's roots

We describe the evolution of Hahnemann's posology in his late work, starting with the publication of the first edition of the Chronic Diseases 1828 until his death in 1842. Our conclusions are based on his publications and the so far published case books. Hahnemann progresses through several intermediary steps from the single dose of a C-potency spaced several weeks apart to the daily administration of C- and Q-potencies. Toward the end of his life he used all these methods, including olfaction, in parallel according to the requirements of the case. We identify and discuss the relevant motivations Hahnemann's wh…