ALB and Hypokalemia: The group with serum albumin <3.9 g/dl or serum potassium <4.0 mmol/l before yokukansan administration had a shorter time of hypokalemia onset than the group with serum albumin ≥3.9 g/dl (P = 0.008) (Figure 1) or serum potassium ≥4.0 mmol/l (P = 0.019) (Figure 2).