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1 Department of Biochemistry, Geigy Pharmaceuticals, Division of CIBA-GEIGY Corporation, Ardsley, New York; Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut
Although the i.p. route is widely used for the administration of compounds to animals, it has not been established whether absorption from the peritoneal cavity occurs through the portal or the systemic circulation. This problem has now been investigated in two species by two experimental approaches. The initial (10 seconds to 5 minutes) rates of appearance of radioactivity in the liver and in the systemic circulation of the rat after the administration of labeled compounds were compared. The substances studied (atropine, caffeine, glucose, glycine and progesterone) represented a variety of physicochemical and biochemical properties. The appearance of radioactivity in the portal vein and in the inferior vena cava of the dog after administration of glucose was also investigated. The results demonstrate that compounds administered i.p. are absorbed primarily through the portal circulation and, therefore, must pass through the liver before reaching other organs.
Submitted on September 15, 1970
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