The success of taeniafuges depends largely upon the preliminary treatment. The parasite is imbedded in mucus, its hooklets fixed in the mucous membrane. The medicament which is administered for its expulsion must come in contact with the scolex. To dislodge a quantity, however large, of the segments (strobila), although temporary relief may follow, will not be permanently curative. The head of the parasite must be expelled.

Before using the taeniafuge the contents of the intestinal canal must be thoroughly evacuated.

Two days of fasting, some milk and bread only being taken, must precede the treatment.