Selective visceral angiography was performed with the ionic, monoacidic, dimeric contrast medium ioxaglate (280 and 320 mg I/ml). Twenty patients with and without disease of the liver and/or pancreas were prospectively and consecutively studied. Changes in the serum activities of ALAT, ASAT, GT, AP, and pancreatic isoamylase and changes in the level of serum bilirubin, prothrombin index and haematocrit were evaluated sequentially before and after angiography. The total volume of contrast medium ranged from 100 to 340 ml per patient and the median dosage was 3.5 ml per kg body weight. There was no statistically significant elevation within the entire group of patients in the measured parameters after angiography when compared with pre-angiographic values. No clinically important toxic effect on the liver or pancreas induced by the contrast medium was found.