
Drosera rotundifolia
Also known as Round-leaved Sundew, Drosera, Youthwort, Lustwort.
Traditionally used in European herbal medicine for respiratory conditions now cultivated due to conservation concerns flavonoids primarily responsible for antispasmodic effects, naphthoquinones for historical use but potentially toxic no Ph. Eur. monograph yet but quality parameters proposed

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| Preparation | As written | Metric |
|---|---|---|
| Dried herb | Dried herb 3 g daily | 3000-3000 mg |
| Dried plant 1-2 g as an infusion three times daily | 1000-2000 mg | |
| (G7) Liquid extract 0.5-2.0 mL (1 : 1 in 25% alcohol) three times daily .(G7) Tincture 0.5-1.0 mL (1 : 5 in 60% alcohol) three times daily | 0.5-2 mL | |
| Dose, 1/10 to 10 drops. | 0-0.2 mL | |
| Dose, of the saturated tincture, 1 to 6 drops; specific drosera to 5 drops. | 0.02-0.12 mL | |
| Mother tincture (1:10 EtOH 45%, fresh herb) |
Doses are reproduced from the sources for practitioners and are not a recommendation for any person.
Clinical Notes. Traditionally used in European herbal medicine for respiratory conditions now cultivated due to conservation concerns flavonoids primarily responsible for antispasmodic effects, naphthoquinones for historical use but potentially toxic no Ph. Eur. monograph yet but quality parameters proposed
Therapy. Drosera, preferably in small doses, is of great value in the spasmodic dry cough characteristic of measles, and to a lesser extent for that of whooping cough and the irritability of the larynx following the latter. There may be simple irritation, particularly centered in the larynx, or inflammation may be present. It also relieves the tickling sensation in that organ giving rise to spasmodic cough. To a lesser extent it is useful in the coughs of bronchitis, incipient phthisis, spasmodic asthma, and in nervous or sympathetic cough occurring reflexly from other diseases. It probably acts upon the vagus.
Therapy. It is an antispasmodic, expectorant, and sedative as applied to such coughs. It will also relieve coughs of sympathetic origin, and so-called nervous coughs. It will cure the cough of measles more quickly than other remedies, and it will cure the after-cough of whooping-cough.
Specific indications and reasoning. The article that has been sold for Dioscorea by most of our druggists for the past ten years, and from which the Dioscorein has been prepared, is a species of smilax. A very good joke on Dioscorein! but unpleasant to those who have expected it to relieve pain in the bowels. True Dioscorea, when recent, is a specific in bilious colic, when given in infusion, or even in tincture. In any case it allays gastro intestinal irritation, and favorably iufluences the vegetative procosses. It is a feeble but certain diaphoretic, and allays irritation of the nervous system.
Drawn from Scudder's Specific Medication and Specific Medicines; King's American Dispensatory, 18th edition (Felter and Lloyd); Ellingwood's American Materia Medica, Therapeutics and Pharmacognosy; Felter's Eclectic Materia Medica, Pharmacology and Therapeutics, and the Bountiful Herbs editorial.

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