According to the Organon , when it comes to prescribing a homeopathic remedy, the choice of posology and dosology is not at random, but indicated by the patient and his presenting state.
Hahnemann gave precise directions on how to select the potency and dosage of a prescription. The Organon contains numerous aphorisms on this topic. The following article is a collation of the information outlined in the Organon:
 Hahnemann, S. (1974). Organon der Heilkunst (2.Auflage) 6B Heidelberg:Karl F. Haug Verlag.