How to select potency, step by step

Potency selection follows the remedy choice. The remedy answers what; the potency answers how strong, on which scale, and how often. The two are separable skills, and the sequence below is the one the classical literature teaches, anchored in the sixth-edition Organon and Kent's Lectures.

The step sequence at a glance

Step 1 — confirm the remedy match

Do not select a potency for a remedy you are not sure of. Height tracks confidence. A certain simillimum, selected on the totality of characteristic symptoms, tolerates a stronger stimulus; a tentative match calls for caution. If the match is uncertain, re-take the case — do not hedge with a low potency on a wrong remedy.

Step 2 — read the patient's vitality

Assess reactive capacity. Lower potencies suit the frail, the very young, the very old, and those weakened by advanced illness; higher potencies suit robust patients with strong vitality. Match the strength of the stimulus to the capacity of the patient to react — do not overwhelm a weak reaction.

Rapidly collapsing vitality — sudden prostration, cold sweat with thready pulse, loss of consciousness, severe respiratory distress, signs of haemorrhage or sepsis — is a red-flag presentation needing prompt assessment alongside the prescription, not a reason to push the potency higher.

Step 3 — weigh mentals against gross pathology

Locate the centre of gravity of the case. Where mental, emotional, and general symptoms dominate, the centesimal tradition reaches higher, on the teaching that higher potencies act on the general plane. Where advanced structural pathology dominates, the same tradition reaches lower, to avoid provoking a strong homeopathic aggravation in fragile tissue.

Step 4 — choose the scale

Decide between the centesimal single-dose approach and the LM/Q repeated approach — the trade-offs are laid out in LM potency vs centesimal and Q potency. In brief: the centesimal scale is stepped and usually single-dosed with a wait; the LM/Q scale is low, ascending, and repeated with succussion before each dose. Reach for LM/Q when a gentler, more adjustable response is wanted, per §246 and §270 of the sixth-edition Organon.

Step 5 — choose height and repetition

Set the specific potency and dosing pattern. On the centesimal scale, a clear match in a robust patient is often given a single higher potency (200C, 1M) and waited on; a fragile case is given a lower potency (6C, 30C). On the LM/Q scale, start low (Q1 or Q2) and ascend with frequent repetition, succussing before each dose. In acute cases the repetition is frequent and the potency moderate; in chronic cases the single dose is spaced or the LM ladder is climbed slowly. This step sits at the core of the wider potency selection decision.

Step 6 — set the follow-up review and adjust

Potency selection is not finished when the dose is given; it is finished when the response has been read. Schedule a follow-up appropriate to the pace of the illness — days for acute work, weeks to months for chronic — and adjust the potency against the response. A short amelioration that relapses indicates the potency was too low or needs repeating; a strong aggravation indicates it was too high; a long, gentle amelioration indicates the choice was well-judged and the case should be left to act. The adjustment closes the loop and feeds the next second prescription.

Traditional indications for scale and height

The tradition's principal heuristics, drawn from the Organon and Kent:

• Mentals and generals predominant, robust vitality — higher centesimal (200C, 1M) or ascending LM from mid-range
• Acute disease, clear remedy — moderate centesimal (30C) repeated frequently until improvement holds
• Sensitive patients, strong mental symptoms — ascending LM scale, Q1 upward, frequent repetition with succussion
• Advanced organic pathology, fragile tissue — low centesimal (6C, 12C) or LM Q1–Q3, infrequent repetition
• Uncertain simillimum — low potency (6C or 30C), single dose, wait and reassess before repeating
• One-sided cases or incomplete symptom pictures — low centesimal, avoid high single doses until the picture clarifies

Boericke's Pocket Manual gives remedy-specific potency guidance in individual materia medica entries and is the practical first reference for standard indications.

Recording the choice and the response

Because step 6 is iterative — the potency is refined at each follow-up against the recorded reaction — a dated record of potency and response is what turns the routine into a learnable pattern. Any case-management workflow that lets you record prescriptions per analysis and compare responses across dated analyses will do; if you want one wired into a free repertory and materia medica, Similia keeps prescription and follow-up records alongside the case.

References

Hahnemann, S. (1842) Organon of the Medical Art, sixth edition, edited and translated by W. B. O'Reilly (1996), Palo Alto: Birdcage Books, aphorisms §246–§248 and §270 on dose, repetition, and the LM (Q) potencies.

Kent, J. T. (1900) Lectures on Homoeopathic Philosophy, Lancaster: Examiner Printing House, Lectures on the potency, the dose, and the single remedy, https://archive.org/details/lecturesonhomoeo00kent.

Close, S. (1924) The Genius of Homoeopathy: Lectures and Essays on Homoeopathic Philosophy, Philadelphia: Boericke & Tafel, chapters on the dose and the potency, https://archive.org/details/geniusofhomoeopa00clos.

Boericke, W. (1927) Pocket Manual of Homoeopathic Materia Medica, ninth edition, Philadelphia: Boericke & Runyon, on dose and potency notation, https://archive.org/details/pocketmanualofho00boer.