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1 The pharmacokinetics and bioavailability of cimetidine were studied after 200 mg oral and intravenous doses in 14 patients with liver cirrhosis, and results were compared to a control group of 12 ulcer patients. 2 In cirrhotic patients, the volume of the central compartment (0.41 +/- 0.06 v 0.19 +/- 0.09 1/kg) and the volume of distribution at steady-state (1.02 +/- 0.17 v 0.80 +/- 0.24 1/kg) were significantly increased. No differences were observed in the area volume of distribution, the total systemic plasma clearance and renal clearance. The non-renal clearance was significantly decreased from 191 +/- 46 to 123 +/- 102 ml/min. 3 The bioavailability of cimetidine (area method) was significantly increased from 60 +/- 23% to 77 /+- 18% in the cirrhotic patients. Also increased was the time during which plasma levels exceeded 0.5 microgram/ml. 4 Urinary excretion of cimetidine was increased in liver cirrhosis by 32% after intravenous and by 36% after oral administration, while the amount of the sulphoxide metabolite decreased accordingly. Creatinine clearance in the cirrhotic patients was highly correlated with the renal clearance of cimetidine as well as its total plasma clearance.