Metabolisme Oxybutynin, der indgives oralt, metaboliseres primært af cytokrom P450- enzymsystemer, i særlig grad af CYP3A4, som fortrinsvis findes i lever og tarmvægge.
Metabolism Oxybutynin administered orally is metabolised primarily by the cytochrome P450 enzyme systems, particularly CYP3A4, found mostly in the liver and gut wall.