Både cytochrom P450- 2D6 og - 1A2 katalyserer dannelsen af de to hovedmetabolitter: glukuronidkonjugat af 4- hydroxy- duloxetin og sulfatkonjugat af 5- hydroxy, 6- methoxy- duloxetin.
Both cytochromes P450-2D6 and 1A2 catalyse the formation of the two major metabolites glucuronide conjugate of 4-hydroxy duloxetine and sulphate conjugate of 5hydroxy,6-methoxy duloxetine.