RT Journal Article SR Electronic T1 XVI. DIFFERENCES IN THE ACTION OF DRUGS ON DIFFERENT PARTS OF THE BOWEL JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics SP 171 OP 191 VO 12 IS 3 A1 WALTER C. ALVAREZ YR 1918 UL http://jpet.aspetjournals.org/content/12/3/171.abstract AB Five segments excised from different parts of the rabbit's intestine have been studied under identioal conditions in warm aerated Locke's solution. Seventy-six substances were tested. Some affected all the segments about equally, while others affected them unequally and even dissimilarly. A number produced effects more or less graded from one end of the tract to the other. It is suggestive that a number of the drugs which through their graded actions might tend to steepen the intestinal gradient are used as laxatives, and a number of those which might tend to reverse the gradient are well-known emetics. Some of the drugs affected the colon particularly. Others had a peculiarly depressant effect on the jejunum. A list of convenient dosages is appended.