Rhus toxicodendron
as H.C. Allen recorded it in Keynotes and Characteristics with Comparisons of Some of the Leading Remedies of the Materia Medica, 1899
This is one author on one remedy. The few symptoms that, when genuinely present, point at one remedy and not its neighbours. Read Rhus toxicodendron in every book at once →
Keynotes
Rhus toxicodendron
Poison Oak. Anacardiaceae.
Adapted to persons of a rheumatic diathesis; bad effects of getting wet, especially after being overheated.
Ailments : from spraining or straining a single part, muscle or tendon (Cal., Nlix) ; overlifting, particularly from stretching high up to reach things; lying on damp ground; too much summer bathing in lake or river.
Affects the fibrous tissue, especially (Rhod. — serous, Bry. ) ; the right side more than the left.
Pains: as if sprained; as if a muscle or tendon was torn from its attachment; as if bones were scraped with a knife; worse after midnight and in wet, rainy weather; affected parts sore to touch.
Lameness, stiffness and pain on first moving after rest, or on getting up in the morning, > by walking or continued motion.
Great restlessness, anxiety, apprehension (Acon., Ars. ) ; cannot remain in bed ; must change position often to obtain relief from pain (from mental anxiety, Ars. ) .
Restless, cannot stay long in one position.
Back: pain between the shoulders on swallowing; pain and stiffness in small of back < sitting or lying, > by motion or lying on something hard.
Great sensitiveness to open air; putting the hand from under the bed-cover brings on cough (Bar., Hep.).
Muscular rheumatism, sciatica, left side (Col.) ; aching in left arm, with heart disease.
Great apprehension at night; fears he will die of being poisoned; cannot remain in bed.
Vertigo, when standing or walking; worse when lying down (better when lying down, Apis) ; < rising from lying, or stooping (Bry.).
Headache : brain feels loose when stepping or shaking the head; sensation of swashing in brain; stupefying; as if torn; from beer; returns from least chagrin; < from sitting, lying, in cold, > warmth and motion.
Dreams of great exertion ; rowing, swimming, working hard at his daily occupation (Bry.).
Corners of mouth ulcerated, fever blisters around mouth and on chin (Nat. m.).
Tongue: dry; sore, red, cracked; triangular red tip ; takes imprint of teeth (Chel., Pod.).
Great thirst, with dry tongue, mouth, and throat.
External genitals inflamed, erysipelatous, oedematous.
A dry, teasing cough, before and during chill, in intermittent fever; cough, with taste of blood.
When acute diseases assume a typhoid form.
Diarrhoea : with beginning typhoid; involuntary, ivith great exhaustion; tearing pain down the posterior part of limbs during stool.
Paralysis: with numbness of affected parts; from getting wet or lying on damp ground; after exertion, parturition, sexual excesses, ague or typhoid; paresis of limbs ; ptosis.
Erysipelas, from 1. to r. ; vesicular, yellow vesicles; much swelling, inflammation; burning, itching, stinging.
Inimical : to, Apis, must not be used before or after.
Compare: Arn., Bry., Rhod., Nat. s., Sulph.
Aggravation. — Before a storm; cold, wet rainy weather; at night, especially after midnight; from getting wet while perspiring ; during rest.
Amelioration. — Warm, dry weather, wrapping up; warm or hot things ; motion; change of position; moving affected parts.
The great characteristic of Rhus is that with few exceptions the pains occur and are < during repose and are > by motion.
Sepia, often quickly > itching and burning of Rhus, the vesicles drying up in a few days.
Rhus is best antidoted by the similimum ; the potentized remedy given internally. The dermatitis should never be treated by topical medicated applications ; they only suppress, never cure.
What the other books say about Rhus toxicodendron
The same remedy read by a different author. They disagree, and the disagreements are where the remedy becomes recognisable.
- Rhus toxicodendron in Boericke — The concise clinical Materia Medica that most Indian colleges teach from, in full.
- Rhus toxicodendron in Farrington — Lectures that teach remedies in families, by comparing them with each other.
- Rhus toxicodendron in Kent — Kent teaching a class, one remedy at a time — fewer remedies, far more on each.
- Rhus toxicodendron in Boger — A compressed key — the generals and the characteristic modalities, with very little narrative.
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Cite this page. H.C. Allen. Keynotes and Characteristics with Comparisons of Some of the Leading Remedies of the Materia Medica. 3rd edition (1910). Philadelphia: Boericke & Tafel. Rhus toxicodendron — Keynotes, pp. 241–244. HomeopathyWorld, https://homeopathyworld.in/materia-medica/books/allen/rhus-toxicodendron. Published 1910: public domain in the US (before 1931) and in India (author died 1909). Replaces B. Jain's 2005 "rearranged and classified" edition (© the publisher), per the owner's decision of 13 Sep 2026. Reproduced as the author wrote it; a historical reference for students and practitioners, not medical advice.