These are remedies which kill or expel intestinal worms.

They have been divided into vermicides, which kill the worm, and vermifuges, which expel the worm without necessarily killing it, e.g. purgatives.

The chief worms which infest the intestine are tape-worms, round-worms, and thread-worms.

The chief Vermicides are :For Thread-Worms. - Local injections of alum, iron, lime-water, quassia, eucalyptol, sodium chloride, and tannin or substances containing it, as catechu, hsematoxylon, kino, rhatany.

For Round-Worms. - Santonin, santonica.

For Tape-Worms. - Areca nut, filix mas, kamala, kousso, pomegranate, pelletierine, turpentine, chloroform.

As Vermifuges. - Castor-oil, scammony, rhubarb.

Adjuncts. - Ammonium chloride, common salt and iron, and bitter tonics, are useful internally in preventing excessive secretion of intestinal mucus, which affords a nidus for intestinal worms.

1 Zeitschr. f. physiol. Chem., vi. 2.

Uses. - They are used to destroy and remove worms present in the intestine. In order that the remedies should come into more intimate contact with the worms, and thus destroy them more easily, it is usual to clear out the intestine by a purgative some hours before the administration of the remedy, which is usually given on an empty stomach, or with a small quantity of milk. After some hours another purgative is given, in order to bring the worms away. As much mucus in the intestine forms a nidus for the worms, remedies which diminish it tend to prevent their occurrence. For this purpose preparations of iron and bitter tonics are useful.