Abstract
Urinary excretion of vitamin B<sub>6</sub>, oxalic acid and vitamin C was investigated in 15 healthy subjects during maximal water diuresis and in the group of 12 patients in polyuric stage of chronic renal failure without dialysis treatment receiving a diet containing high sodium chloride (15g/day). Urinary excretions of the same parameters were investigated in another group of 15 patients in polyuric stage of chronic renal failure without dialysis treatment after i.v. administration of 20 mg furosemide. Urinary excretion of vitamin B<sub>6</sub>, oxalic acid and vitamin C significantly increased during maximal water diuresis while during high intake of sodium chloride the urinary excretions of these substances were not affected. The results suggest that urinary excretion of vitamin B<sub>6</sub>, oxalic acid and vitamin C depends on the urinary excretion of water. Intravenous administration of 20 mg furosemide led to an increase of urinary excretion of vitamin B<sub>6</sub>, oxalic acid and vitamin C in patients with chronic renal failure. The increased urinary excretion of vitamin B<sub>6</sub> and vitamin C is a new negative side effect of furosemide and increased urinary excretion of oxalic acid is a new positive side effect in patients with chronic renal failure.
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