Tacrolimus starting dose -- CYP3A5
CPIC: expressers need ~1.5-2x the non-expresser starting dose.
Carbamazepine safety screen -- HLA-B*15:02
CPIC/FDA: test before starting in patients of Asian (incl. Indian) ancestry.
Phenytoin dose adjustment -- CYP2C9
CPIC: PM ≥50% reduction, IM ≥25% reduction of starting dose.