
Dioscorea villosa
Also known as Colic root, Rhematism root, China root, Dioscorea, Rheumatism-root, yam, Mexican wild yam.
The decoction of dioscorea has been wonderfully effective in some cases of bilious colic and has signally failed in others. If it does not give relief in a half hour it is not likely to succeed. The specific medicine administered in hot water has the same effect.

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| Preparation | As written | Metric |
|---|---|---|
| Tincture (1:3) | 3-5 ml TID (dose frequently for acute) | 3-5 mL |
| Decoction | 2-3 tsp/c TID | |
| dose one, to two fluid ounces every half hour in colic | 29.57-59.15 mL | |
| Dioscorein | Dose, from one to four grains. | 64.8-259 mg |
| Specific Medicine Dioscorea | Dose, from one to forty minims. | 0.06-2.46 mL |
| Fifteen drops of the tincture of the specific dioscorea in half a teacupful of hot water should be drunk at a single dose, as in acute cases it is much more certain if given in this manner. | 0.75-0.75 mL |
Doses are reproduced from the sources for practitioners and are not a recommendation for any person.
Action and Therapy. The decoction of dioscorea has been wonderfully effective in some cases of bilious colic and has signally failed in others. If it does not give relief in a half hour it is not likely to succeed. The specific medicine administered in hot water has the same effect.
Therapy. In the spasmodic pain of cholera morbus or cholera infantum, of diarrhea or dysentery it is useful. In neuralgic dysmenorrhea, in ovarian neuralgia, in cramp-like pains in the uterus at any time and in severe after pains it often acts satisfactorily, quickly relieving the muscular spasm.
Properties and Uses. The roots were an aboriginal remedy, and were introduced to the notice of the profession by Dr. Horton Howard though claimed by the Eclectics as dicentra and others are. It is largely relaxant and moderately stimulant, acting as an antispasmodic, and relieving nervous excitement.
Action and Medical Uses. These troches are useful in cases of colic, flatulency, borborygmi, and to cure as well as prevent a return of bilious colic. Each troche contains 2 grains of extract of dioscorea (J. King).
Drawn from Cook's Physio-Medical Dispensatory; Scudder's Specific Medication and Specific Medicines; King's American Dispensatory, 18th edition (Felter and Lloyd); Ellingwood's American Materia Medica, Therapeutics and Pharmacognosy, and the Bountiful Herbs editorial.
Wild yam stands in 17 documented formulas in the library, among them IBS Calming Formula, sõu fêng shùn gì wán, rén shèn wũ méi tāng, shi b wán.

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