Anthelmintic Medication for Parasites in the 
Lumen of the Digestive Tract 
In a previous paper the writer has summarized, in a general way, 
our knowledge of anthelmintics for the control of worms outside of 
the lumen of the digestive tract of man and animals, the definite 
knowledge on that subject in the fields of human and veterinary 
medicine not making a total too large for brief consideration in one 
article. In this paper the subject of drugs for the removal of parasites 
from the lumen of the digestive tract will be considered, primarily 
with reference to their use among domesticated animals, with little 
consideration of the rather large subject of anthelmintics used in 
human medicine to remove parasites from the lumen of the digestive 
tract. 
We have at the present time quite satisfactory treatments for the 
removal of many of the common parasites of the digestive tract, the 
treatments in some cases being established by critical tests and the 
tests subsequently supported by clinical experience, and in other cases 
being established by clinical experience and clinical experience subse¬ 
quently supported by critical tests. On the other hand, there are a 
number of parasites for which we have as yet no satisfactory treat¬ 
ment, notably the spirurids living partly in the lining and partly in the 
lumen of the digestive tract, and the tapeworms of birds. 
FASTING 
In administering anthelmintics by mouth, it is customary to fast 
the animals to be treated in order to diminish the amount of ingesta 
in the digestive tract, this ingesta acting as a diluent for the anthelmin¬ 
tic and also affording mechanical protection to worms in some instances. 
The length of the preliminary fast varies with the nature of the host 
animal and the location of the worm. A fast of 18 hours has been 
