Udskillelse Oxybutynin metaboliseres i stort omfang af leveren (se ovenfor) med mindre end 0, 1% af den indgivne dosis udskilt i uforandret form i urinen.
Excretion Oxybutynin is extensively metabolised by the liver, see above with less than 0.1% of the administered dose excreted unchanged in the urine.