In vitro- undersøgelser indikerer, at CYP2D6, CYP2C9, CYP1A2 og CYP2C19 også kan katalysere den primære metaboliseringsvej, men deres kvantitative roller in vivo er ikke undersøgt.
In vitro studies indicate that CYP2D6, CYP2C9, CYP1A2 and CYP2C19 also can catalyse the main metabolic pathway, but their quantitative roles have not been studied in vivo.