Omkring 50% udskilles ved glomerulær filtration og omkring 50% gennem renal tubulær sekretion inden for 24 timer, med hovedparten elimineret inden for 6 timer; høje koncentrationer opnås i urinen.
About 50% is excreted by glomerular filtration and about 50% through renal tubular secretion within 24 hours, with the majority being eliminated within 6 hours; high concentrations are achieved in the urine.