Laboratory changes were consistent with the known biochemical effects of Aml, Val, and HCTZ; eg, increases in mean blood urea nitrogen were observed in all of the treatment groups, and increases in mean uric acid occurred in the treatment groups that received HCTZ. Mean potassium decreased in all of the groups receiving HCTZ, with the greatest decrease in the Aml/HCTZ group (−0.39 mmol/L) and smaller decreases in the Aml/Val/HCTZ (−0.16 mmol/L) and the Val/HCTZ (−0.08 mmol/L) groups. A slight increase in potassium was observed in the Aml/Val group (0.04 mmol/L). Mean changes from baseline in other biochemistry tests were relatively small, with no clinically relevant differences among treatment groups.