Amphetamine is thought to inhibit monoamine oxidase, While the flexibility of amphetamine and its metabolites to inhibit a variety of P450 isozymes as well as other enzymes has not been adequately elucidated. In vitro experiments with human microsomes reveal small inhibition of CYP2D6 by amphetamine and slight inhibition of CYP1A2, https://prosyntheticchems.com/product/adderall-xr/