Linked from
The 11 pages that link to CYP2D6, each with the reason it gives.
CodeineRelated: CYP2D6 converts codeine into morphine, shaping both benefit and risk.
DextromethorphanRelated: Variation in this enzyme changes dextromethorphan metabolism and exposure.
TamoxifenRelated: Its activity can affect how much endoxifen a person produces.
TramadolRelated: CYP2D6 converts tramadol into its more potent opioid metabolite.
HydrocodoneRelated: Differences in CYP2D6 activity can change how much hydromorphone forms.