The rhizome with the persistent bases of the petioles of Aspidium

Filix mas. Collected late in the autumn, divested of its scales, roots, and all dead portions, and carefully dried with a gentle heat.

Should not be used if more than a year old, B.P. The rhizome of Aspidium Filix-mas and of Aspidium marginale, U.S.

Characters. - Tufted, scaly, greenish-brown; powder greenish-yellow, with a disagreeable odour, and a nauseous, bitter, somewhat astringent taste.

Composition. - A dark green oil which deposits crystals of filicic acid, also traces of volatile oil. The filicic acid is regarded as the chief, though not the only, active principle; tannin, resin, and sugar have been found in the rhizome.

Dose. - Of the powder, 60-180 gr.

Preparations.

B.P.

Dose.

Extractum Filicis Liquidum..........................................................

15 min.-l fl. dr.

U.S.P.

Oleoresina Aspidii .........................................................................

30-60 min.

Action and Uses. - The liquid extract is one of the best anthelmintics against tape-worm, killing the Bothriocephalus latus, Taenia solium, and Taenia mediocanellata. Pomegranate root bark is said to kill the latter with greater certainty. The dose often given is too small, and hence failure is attributed to the drug when it really depends on the smallness of the dose. Single doses of 3j.-3jSS. of the liquid extract will often cure at once.

Method of Administration. - Allow the patient to take no food after five or six in the evening except a little bread-and-milk. Just before bed-time give 3j. of the liquid extract in 3j. of mucilage, and let the patient lie down immediately and go to sleep. This often prevents the vomiting which sometimes occurs. Next morning administer a purgative, and repeat the treatment until the worm comes away.,

Another method is to give a dose of castor oil at night (with the same conditions of feeding) and early next morning give a dose of liquid extract (3SS.-3j.), and abstain from food till after the bowels have acted.