“Intravenous administration of 20 mg furosemide led to an increase of urinary excretion of vitamin B6 , oxalic acid and vitamin C in patients with chronic renal failure.”
“The increased urinary excretion of vitamin B6 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.”