It would take an enourmously astute clinician to tell—using casual clinical observations—the difference between the first and second bars. So the clinical impression is that there is no clinically important interaction.

Note that the INX is likely to help some patients by getting them out of the subtherapeutic range (2^nd bar). Hence, if the severity of the toxicity is modest, you might do as much good as harm from this interaction (albeit inadvertantly).