4cfc52b1__for_Professionals___Drugs_com__Interaction
[Drug or Test] Test, γ-glutamyl transferase (γ-glutamyltranspeptidase, GGT, GGTP) [Interaction] 
Phenytoin may produce increased serum γ-glutamyl transferase concentrations
Phenytoin Sodium Monograph for Professionals - Drugs.com
Interaction