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Piscidia.

Botanical name:

Synonym.—Jamaica Dogwood.

Piscidia is the root bark of Piscidia Erythrina, Linn. (N.O. Leguminosae), a shrub found in South America and the West Indies, where it is used as a fish poison. The bark occurs in quills or curved pieces, from 5 to 15 centimetres in length, and from 4 to 6 millimetres in thickness. It is orange-brown to dark greyish-brown externally, wrinkled with thin longitudinal and transverse ridges, and somewhat fissured. The inner surface is brownish, and smooth or fibrous. The bark breaks with a tough, fibrous fracture, showing greenish patches. It has a characteristic odour, and a bitter, somewhat acid, taste.

Constituents.—The chief constituents of the bark are resin, fat, a crystallisable substance named piscidin, and a bitter glucoside which is soluble in water.

Action and Uses.—Piscidia dilates the pupil, but its action has not yet been clearly defined. It is a general sedative, and has been used for toothache, neuralgia, irritant coughs, and as an antispasmodic in asthma; also in dysmenorrhoea and nervous debility. It is administered in the form of extract or liquid extract.

PREPARATIONS.

Extractum Piscidiae, B.P.C.—EXTRACT OF PISCIDIA.
Dose.—6 to 30 centigrams (1 to 5 grains).
Extractum Piscidiae Liquidum, B.P.C.—LIQUID EXTRACT OF PISCIDIA. 1 in 1.
Has a sedative action, and has been recommended as a narcotic, being said to cause neither headache nor constipation. Dose.—2 to 8 mils (1/2 to 2 fluid drachms).

The British Pharmaceutical Codex, 1911, was published by direction of the Council of the Pharmaceutical Society of Great Britain.



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