Besides the thymol studied above, several other drugs are used for the expulsion of worms from the human body. These are:

Aspidium, which consists of the rhizomes and stipes of Dryopteris Filix-mas, or of D. marginalis (Fam. Polypodiacece). From the powdered drug is obtained the active Oleoresina Aspidii.

Santoninum, which is a neutral principle, the inner anhydride of santonic acid, is obtained from the unexpanded flower-heads of Artemisia pauciflora, or "Levant Wormseed" (Fam. Compositae).

Quassia, which is the wood of Picrasma excelsa, or that of Quassia amara (both of the Fam. Simarubacece).

Zincum

Oleoresina Aspidii is an efficient anthelmintic for the treatment of tapeworm ( Taenice). Single dose, 2 Gm., once a day.

Santonin is an efficient, though sometimes toxic, anthelmintic for the treatment of round-worm (Ascaris lumbricoides). Dose, 0.06 Gm.

Quassia, in the form of warm aqueous extracts injected into the rectum and sigmoid, is an efficient anthelmintic in the treatment of thread- or seat-worms (Oxyuris vermicularis).