“… methimazole … magnesium concentration both in erythrocytes (2.00 +/- 0.18 vs. 2.08 +/- 0.24 mmol/l cells, P < 0.05) and in serum (0.72 +/- …/l, P < 0.001) but both urinary output and fractional excretion of magnesium decreased significantly (P < 0.05 and P < 0.001, respectively).”