RT Journal Article SR Electronic T1 INTERACTION OF PILOCARPINE AND HISTAMIN ON THE INTESTINE JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics SP 509 OP 514 VO 43 IS 3 A1 FREDERICK BERNHEIM YR 1931 UL http://jpet.aspetjournals.org/content/43/3/509.abstract AB 1. The sensitivity of various parts of the guinea pig's intestine to pilocarpine varies in the same way as the sensitivity of the dog's and cat's intestine to histamin as described by McKaye. 2. The duodenum and jejunum of the guinea pig contracted by histamin are relaxed by the addition of pilocarpine in concentrations as low as 1 part in 1,500,000. Further addition of histamin after this relaxation is without effect unless atropin is first added. The ileum is not relaxed by pilocarpine. 3. This confirms pharmacologically the results of several workers who have shown that electrical stimulation of the parasympathetics may under certain conditions cause gastro-intestinal relaxation.