Which potency? A working method for choosing between 30, 200 and 1M

Why nobody gives you a straight answer

Ask ten homeopaths which potency to use and you get ten answers, all delivered with confidence. That is not evasion. Potency genuinely is not determined by the disease name, so any rule of the form "use 200 for acute fever" is wrong before it is even applied.

What it does follow from is a small number of things you assessed during the case, whether or not you noticed you were assessing them. Making those explicit turns potency from a guess into a decision you can defend and, more usefully, learn from.

The three inputs

1. Susceptibility

Susceptibility is how readily this patient's system responds to a stimulus. It is the single biggest input and the one most often skipped.

High susceptibility looks like: young, reactive, symptoms that shift quickly, intense and clearly marked mental symptoms, a history of responding strongly to previous prescriptions or to conventional drugs, sensitivity to smells, noise or emotional atmosphere.

Low susceptibility looks like: long-standing pathology, sluggish response to everything, gross structural change, heavy conventional medication, advanced age, an obtunded or flat mental state.

The higher the susceptibility, the more careful you should be with high potencies and with repetition. A very reactive patient can be thoroughly upset by a 1M given casually.

2. The level of the disturbance

Where does this illness live?

• Predominantly local and physical — a mechanical joint problem, a local skin lesion with no general picture — sits lower. Lower potencies, more willingness to repeat.
• Predominantly general and mental — the whole person is changed, and the mental symptoms are the most striking thing in the case — sits higher.

This is a restatement of the classical hierarchy: the higher the plane of the disturbance, the higher the potency that addresses it.

3. How certain is your prescription?

This one is rarely stated but governs practice more than either of the others.

A remedy you chose from three sharply individualising symptoms, confirmed across two authors, with a clear exciting cause, is a different proposition from a remedy that came top of a repertorisation by two marks over its neighbour.

Certainty earns potency. When you are confident, a single higher-potency dose and a long wait is efficient and clean. When you are not, a lower potency limits both the depth of any aggravation and the length of time you spend unable to tell what is happening.

There is no shame in the second situation. Most cases early in practice are the second situation.

Putting them together

Treat this as a starting point that a follow-up will correct, not a lookup table. The follow-up is where posology is actually decided.

Repetition matters more than the number

Students argue about 200 versus 1M and then repeat the remedy daily for three weeks, which undoes the distinction entirely. The classical position is straightforward: do not repeat while improvement continues. A remedy that is acting does not need help; repeating into an established action is the commonest way to produce a needless aggravation and to confuse a case that was going well.

Practically:

• Give the dose.
• Set an interval that matches the pace of the illness — hours in an acute, weeks in a chronic.
• Repeat only when improvement clearly stalls, and reassess before you do.
• If the picture has changed rather than stalled, the question is not potency. It is whether this is still the right remedy, or whether you are now looking at a new state. See when a well-selected remedy fails.

What Hahnemann actually settled on

The sixth edition of the Organon moves away from repeated dry doses toward the medicinal solution: the remedy dissolved, succussed before each dose, given in slightly ascending strength. The reasoning is in aphorisms 246 to 248 — that a slightly altered dose each time avoids the aggravation that comes from giving the identical stimulus over and over.

You can read the aphorisms in full in the Organon of Medicine. It is worth reading §246 alongside §275 to §283 in one sitting, because together they are the whole of Hahnemann's posology, and they are considerably less dogmatic than the tradition built on top of them.

Record it, or you will never learn it

Potency judgement improves only from feedback, and feedback needs a record. Before the follow-up, write down:

1. The potency and dose given, with the date.
2. What you expect to change, and roughly by when.
3. What actually changed, at the next visit.

Ten cases recorded this way will teach you more about potency than any amount of reading, because they are your patients and your susceptibility judgements. Fifty cases without that record teach almost nothing, because you cannot reconstruct what you were thinking at the time.

A note on scope

Potency selection is a decision within homeopathic practice. It does not substitute for recognising when a case needs investigation or referral. Advanced pathology, red-flag symptoms and deteriorating patients need the appropriate medical pathway regardless of what is on the prescription — and a low potency chosen because the case is grave is not the same thing as a case being managed.