Psorinum is the psoric nosode, and one idea organises the whole remedy: lack of vital reaction. Clarke names it outright — "the chief of the keynotes of Pso. is: Lack of vital reaction; prostration after acute disease, depressed, hopeless, night-sweats" — and the chilliness, the foulness and the despair all hang off that central failure of response. It is a practitioner's remedy, most often reached for where prescribing has stopped working.
Prepared from the serum of a scabies vesicle (Clarke records Hahnemann's original source), Psorinum is the remedy-level completion of the psoric miasm, whose framework is set out in our guide to the three miasms. What follows assembles the Psorinum materia medica from the public-domain authorities — Boericke, Clarke, Kent, H. C. Allen and Nash — and shows how to confirm each keynote at the case-taking table; the full symptom lists are always in the materia medica. This is education for practitioners and serious students, not self-treatment advice.
The Nosode, and the Rule That Governs It
One point of method before any keynote. H. C. Allen closes his Psorinum chapter with the sentence every prescriber should read first: "Psorinum should not be given for psora or the psoric diathesis, but like every other remedy, upon a strict individualization — the totality of the symptoms." A psoric history, suppressed eruptions or a stalled case put the nosode on the study list; the symptoms must still agree. Nash, who defends the nosodes without reservation — "we must not let prejudice hinder honest investigation" — never found them markedly efficacious used against the disease that produced them, yet cured itch-like eruptions with Psorinum in patients with no traceable history of scabies. The picture, not the pedigree, prescribes.
Lack of Vital Reaction: The Chief Keynote
Boericke states the indication in a single clause — "Lack of reaction, i.e. phagocytes defective; when well-chosen remedies fail to act" — and pairs it with debility independent of any organic disease, especially the weakness remaining after acute disease. That is the classical Psorinum situation: the illness is over and the patient has simply not come back.
H. C. Allen turns this into the most quoted distinction in the literature of the remedy: Psorinum is indicated "in chronic cases when well selected remedies fail to relieve or permanently improve (in acute diseases, Sulph.); when Sulphur seems indicated but fails to act." Both conditions matter: the remedies must have been well selected, and the case chronic. This is not a rescue for careless prescribing.
Kent describes the same state from the inside: "remedies cause improvement but a short time and then the symptoms change and another remedy must be selected. It is a state of feeble reaction." His classic scene is a psoric patient after typhoid, in whom convalescence never begins — no appetite, worse sitting up, lying "with his arms abducted from his side, thrown across the bed." His summary: "Psorinum is slowed down in all of its functions; a state of paretic weakness." The bladder is full yet empties slowly, and he can never finish stool or urination.
Clarke reports the same in a cured case — a woman convalescing from typhoid, "stationary, no appetite," changed to a ravenous appetite by Psorinum 400 (J. B. Bell). Nash puts it plainest: great debility, sweats on the slightest movement, wants to give up and lie down.
The Hopelessness
The mental state is the psychological face of the failed reaction, and it is often what makes the prescription. Boericke gives it in three words — "Hopeless; despairs of recovery" — with melancholy "deep and persistent; religious," and a suicidal tendency. Nash calls the patient "very sad, hopeless, despondent; 'bluest of the blue.'"
Allen fills in the content of the despair: anxious, full of fear; evil forebodings; religious melancholy; despairs of salvation, of recovery; fears he will die, that he will fail in business — "making his own life and that of those about him intolerable." Kent's is the most recognisable, because the fear does not match the facts: "His business is prosperous, yet he feels as if he were going to the poor house." There is no joy and no realisation of benefit; he takes no pleasure in his family and wants to be alone. Clarke adds that slight emotions produce severe ailments, and both he and Kent describe the patient driven to despair by continual itching.
Foulness: The Second Keynote
Clarke names it explicitly — "'Foulness' may be considered the second keynote of Pso." — and it runs through every region. Boericke: "Secretions have a filthy smell." Allen: all excretions — diarrhoea, leucorrhoea, menses, perspiration — have a carrion-like odour, and the body has a filthy smell even after bathing.
Kent thinks it characteristic enough to prescribe on: "fetid odors, fetid breath, discharges and oozing from the skin smelling like carrion; stool so offensive that the odor permeates the whole house." Allen's otorrhoea is thin, ichorous, horribly fetid, like decayed meat. The patient is, in Kent's phrase, "offensive to sight and smell."
The visual half is as specific. Nash: "dirty, the great unwashed, unwashable." Kent: the skin looks filthy though it has been well washed — a dingy, dirty, foul look, as if covered with dirt — and the patient dreads to be washed. Boericke adds oily skin and dry, lustreless, rough hair.
The Chilliness, and the Paradox on the Skin
This is the most quotable differential in the remedy, and Clarke wrote it as such: "One great mark of distinction between Sul. and Pso. is that the Pso. patient is exceedingly chilly, likes to have a fur cap on in summer; whilst the Sul. patient is predominatingly hot."
Boericke agrees: "Psorinum is a cold medicine; wants the head kept warm, wants warm clothing even in summer... Dread of least cold air or draft. Better, heat." Allen makes it observational — the patient wears a fur cap, overcoat or shawl even in the hottest summer weather. Kent localises it to the head: the scalp is cold, and the patient is worse from uncovering the head and worse from getting the hair cut.
Then comes the paradox that catches out students. Kent states it in a few words — "Sensitive to cold yet the skin is worse from heat" — and it is a layering, not a contradiction. The general state wants warmth and dreads draughts; the eruption itches violently in the warmth of the bed, is worse from bathing, and is relieved by cool air, which Kent calls "the opposite of the general Psorinum state, which is aggravated from the open air." Get the two layers the wrong way round and the case will not read. One further general: Boericke's "Worse, coffee; Psorinum patient does not improve while using coffee" — Clarke lists coffee as the antidote.
"Feels Unusually Well the Day Before the Attack"
Allen lists it among the keynotes: "Feels unusually well day before attack." Clarke calls it "a symptom not seldom met with in practice and useful to remember." In periodic complaints — the recurring headache, the annual hay fever, the winter cough — the patient reports an unnatural surge of energy or cheerfulness the day before the trouble returns. The related weather sign belongs in the same breath: the patient is restless for days before a thunderstorm (Allen).
Physical Affinities
Several of the states below are serious in their own right — asthma, quinsy, chronic otorrhoea, the infantile diarrhoeas, failure to convalesce after typhoid — and they demand proper clinical assessment and, where appropriate, conventional care alongside the homeopathic prescription.
Skin
Boericke calls the skin symptoms "very prominent," and the shape is consistent: intolerable itching, worse from the warmth of the bed; herpetic eruptions on the scalp and in the bends of the joints; eczema behind the ears; indolent ulcers slow to heal; urticaria after every exertion. Nash adds the seasonal rhythm: dry, scaly eruptions which disappear in summer and return in winter, with a cough returning alongside them. Kent's moist eczema is the fullest account: new crops of vesicles under the old crusts. Allen adds the aetiology: bad effects from suppression by sulphur and zinc ointments, and ailments from suppressed itch when Sulphur fails to relieve.
Head and the hungry headache
The headache has a signature concomitant. Allen: "Headache: always hungry during; better while eating" — Kent's patient "must get up at night for something to eat." Boericke adds hammering pain with vertigo and a sensation that the brain feels too large; worse from change of weather. It may be preceded by flickering, dimness of vision or spots before the eyes, and relieved by nosebleed (Allen; Clarke). Kent notes the alternation: the headache goes and the winter cough appears, then reverses.
Ears, throat and glands
Chronic fetid otorrhoea is one of the remedy's strongest fields. Boericke: "Most fetid pus from ears, brownish, offensive," with raw, red, oozing scabs around the ears; Kent adds the aetiology — discharge resulting from scarlet fever, abscess in the middle ear, otitis media — and Allen the chronic form after measles or scarlatina. In the throat, Boericke and Allen converge on quinsy: tonsils greatly swollen, painful swallowing with pain extending to the ears, profuse offensive saliva, tough mucus that must be hawked continually, and the remedy "eradicates tendency to quinsy" (Boericke) — confirmed by cheesy, pea-like balls hawked up, of disgusting smell and taste (Allen; Clarke).
Stomach and stool
Boericke: "Very hungry always; must have something to eat in the middle of the night" — a general rather than a stomach symptom. Eructations like bad eggs run through Boericke, Allen and Kent alike. The stool then shows two faces, and both are Psorinum: diarrhoea that is watery, dark brown, horribly fetid, smelling like carrion, often involuntary and worse at night (Allen times it from 1 to 4 a.m.; Clarke, Kent and Nash all connect it with cholera infantum), and its opposite, obstinate constipation from inactivity of the rectum, with a soft, normal stool that cannot be expelled at one sitting (Kent; Allen). Both are the same paretic weakness.
Chest, asthma and the position of the arms
This is the most remedy-specific posture in the materia medica. Boericke: "Asthma, with dyspnoea; worse, sitting up; better, lying down and keeping arms spread wide apart." Allen states it as the reverse of Arsenicum; Kent writes that the patient "wants to go home and lie down so that he can breathe," and that such symptoms are "found in very few remedies and in none so marked as in Psorinum." Alongside it: a dry, hard cough with great weakness in the chest, a feeling of ulceration under the sternum, and cough returning every winter after suppressed eruption (Boericke; Allen).
Hay fever
Clarke's testimonial: "Pso. has cured more cases of hay fever in my practice than any other single remedy" — correct the psoric basis, he argues, and the irritating agents lose their effect. Allen makes the indication precise: hay fever appearing regularly every year on the same day of the month, in a patient with an asthmatic, psoric or eczematous history, treated in the previous winter rather than in the season. Kent adds the caveat: it "belongs to a low constitution which must be built up before the hay fever will cease... not in one season, so do not be disappointed."
Key Modalities
- Worse: cold air, draughts, uncovering the head; changes of weather and before a thunderstorm; open air; sitting up; motion and exertion; coffee; evening and before midnight. (Boericke; Clarke; Nash)
- Better: heat and warm wrapping even in summer; lying down, including the dyspnoea; rest indoors; while eating; after profuse sweat, which relieves all suffering. (Boericke; Allen; Clarke)
- Reversed on the skin: itching worse from the warmth of the bed and from bathing, better in cool air. (Kent; Nash)
Keynote Symptoms
Each is traceable to a named authority; keynotes accelerate recognition rather than replace the totality.
- Lack of vital reaction — well-selected remedies fail to act, or act only briefly. (Boericke; Clarke; Allen; Kent)
- Debility remaining after acute disease, without organic lesion; sweats on the slightest exertion. (Boericke; Nash)
- Hopeless; despairs of recovery; believes he will go to the poor house though his business prospers. (Boericke; Kent)
- Body has a filthy smell even after bathing; all excretions carrion-like. (Allen; Kent; Clarke)
- Exceedingly chilly — wears a fur cap or shawl in the hottest weather; dreads the least draught. (Clarke; Boericke; Nash)
- Skin looks dirty and unwashable; intolerable itching worse from the warmth of the bed. (Kent; Nash)
- Feels unusually well the day before the attack. (Allen; Clarke)
- Hungry in the middle of the night; headache with hunger, better while eating. (Boericke; Allen; Kent)
- Asthma better lying down with the arms stretched wide apart, worse sitting up and in the open air. (Boericke; Allen; Kent)
- Great effort to expel a soft, normal stool — never finishes it at one sitting. (Kent)
Potency and Repetition, as the Sources Record It
Boericke's dose note is short and specific: two hundredth and higher potencies, and the remedy "should not be repeated too often" — he cites Aegidi that Psorinum "requires something like 9 days before it manifests its action, and even a single dose may elicit other symptoms lasting for weeks." Clarke, who calls it a remedy "proved entirely in the potencies," reports cures from the 30th up to Fincke's very high potencies — among them a single dose of the 42m in water, two doses of it six weeks apart, and a 200 every third night. That is classical posology reported as study material, not a prescribing instruction; our potency selection guide sets out how the decision is usually reasoned.
Differential Diagnosis
Versus Sulphur
The essential comparison. Clarke's thermal line decides most cases: Psorinum is exceedingly chilly and wants a fur cap in summer, the Sulphur patient is "predominatingly hot." Boericke's Sulphur signature confirms it from the other side — ebullitions of heat, red orifices, a sinking feeling at the stomach about 11 a.m. and an aversion to being washed — and itching worse from the warmth of the bed is the one modality the two share. The second axis is Allen's: Sulphur is the reaction remedy in acute disease (Boericke: it "frequently arouses the reactionary powers of the organism... especially in acute diseases"); Psorinum is the reaction remedy in chronic cases, and specifically when Sulphur seemed indicated and failed. Kent adds a confirmatory: Psorinum's chronic diarrhoea is frequent day and night, "unlike Sulphur, the remedy it most resembles," whose morning diarrhoea is painless and drives him out of bed (Boericke). The full picture is in our Sulphur guide; Sulphur's place among the major polycrests explains why it is met first.
Versus Tuberculinum
Allen lists Tuberculinum among Psorinum's relations, and the overlap is real: Boericke's Tuberculinum also has low recuperative powers, is "very susceptible to changes in the weather," and is indicated "when symptoms are constantly changing and well-selected remedies fail to improve." The separator is thermal: Tuberculinum longs for cold air, is better in the open and wants constant changes; Psorinum wants a warm room, is worse in the open air and is slowed down in all its functions. Clarke records that Bacillinum is the acute of Psorinum, which places the tubercular group alongside rather than inside it. See our Tuberculinum guide.
Versus Medorrhinum
Both nosodes are hopeless of recovery — Boericke uses that phrase for Medorrhinum — so the generals must decide. Medorrhinum is worse from heat and from daylight to sunset, better at the seashore and lying on the stomach; Psorinum is worse from cold, better wrapped up and lying on the back with the arms spread. Medorrhinum's discharges are offensive too, but its picture is sycotic — warts, thickened catarrh, intensity of all sensations, time passing too slowly — where Psorinum's is deficiency and exhaustion. Our Medorrhinum guide covers the sycotic side.
Versus Carbo vegetabilis
Clarke pairs them directly under lack of reaction, distinguishing Carbo veg as "emaciated, weak pulse" against Psorinum's "psoric diathesis"; Nash makes the same association for complaints dating back to an imperfectly cured acute illness. Boericke's Carbo veg is "persons who have never fully recovered from the effects of some previous illness." The decider is air: the Carbo veg patient is icy-cold yet must have air, must be fanned hard, must have all the windows open, where the Psorinum patient wants them shut, a cap on, and a warm room.
Versus Kali carbonicum
Another remedy of weakness, coldness and depression: Boericke's Kali carb has soft pulse, general depression, sensitivity to every atmospheric change and intolerance of cold weather, sweat, backache and weakness, better in warm weather. Clarke supplies the deciding mark, comparing the two in convalescence with profuse sweat: "K. ca. has not the hopelessness of Pso." Add Kali carb's own signature: a patient who never wants to be left alone, where the Psorinum patient wants exactly that.
The Differential at a Glance
| Remedy | Thermal state | Core weakness | Mind | Deciding mark |
|---|---|---|---|---|
| Psorinum | Exceedingly chilly; fur cap in summer; worse open air | Chronic failure of reaction; never convalesces | Hopeless, irritable, wants to be alone | Foul odour washing will not remove; better lying down, arms spread wide |
| Sulphur | "Predominatingly hot" (Clarke); ebullitions of heat | Acute failure of reaction; complaints that relapse | Irritable, depressed, very selfish; averse to business | 11 a.m. sinking; red orifices; aversion to being washed |
| Tuberculinum | Longs for cold air; better in the open | Low recuperative power; rapid emaciation | Always tired; wants constant changes; averse to work | Symptoms constantly changing; worse before a storm and from draught |
| Medorrhinum | Worse heat; better at the seashore and in damp | Sycotic depth; chronic pelvic and rheumatic states | Hopeless of recovery, hurried, exalted sensibility | Better lying on the stomach; worse from daylight to sunset |
| Carbo veg. | Icy-cold body yet craves moving air | Never recovered from a previous illness | Sluggish; aversion to darkness | Must be fanned, windows open; better from eructation |
| Kali carb. | Chilly, intolerant of cold; better warm weather | Paretic weakness with sweat and backache | Irritable, fearful, never wants to be left alone | Stitching pains anywhere; 3 a.m. aggravation; no hopelessness |
Repertorisation Tips
Psorinum rarely wins a repertorisation on common rubrics: it is small print in most chapters, buried under the polycrests. Build the analysis from its peculiars. Start with the two rubrics that are almost the remedy's definition: lack of reaction, well-selected remedies failing to act, and ailments from suppressed eruptions. Add the thermal contradiction as a pair — chilliness with desire to be wrapped up, alongside itching aggravated by the warmth of the bed — which separates Psorinum from Sulphur mechanically. Then the confirmatory peculiars: feels unusually well the day before the attack; hunger in the middle of the night; headache with hunger, better while eating; asthma better lying with the arms spread apart; carrion-like discharges; difficult expulsion of a soft stool.
Three or four of those, read across Kent, Murphy and the Complete Repertory in the online repertory, bring the nosode into view where a broad "debility" rubric never would. One caution: a case calling for Psorinum is by definition one where prescribing has already gone wrong once, so re-take it before you re-prescribe — our case-taking guide covers capturing the generals verbatim.
Deepening Your Study
Read Psorinum in the original, and across authors — no single source carries the whole remedy. Boericke gives the compact keynotes and modalities; Clarke's Dictionary is unusually rich here; H. C. Allen supplies the decisive Sulphur distinction and the individualisation rule; Kent's Lectures give the constitution in motion; Nash adds the practitioner's shorthand.
In Similia they sit side by side: the Boericke entry, Clarke's Dictionary chapter and Kent's lecture are in the free library, which carries 21 classic materia medica books, 7 classical repertories and AI semantic search alongside basic case management. Read them against one another, then test the rubrics above on a case you already know. The software accelerates retrieval; the judgement remains yours.
