I wish to know why there is an interaction between this drug and proton-pump inhibitors such as omeprazol. Does that have to do with the elimination-process? I have a patient that is a rapid metabolizer for CYP2C19(has both alleles variant *17), and he has a very low blood level of zuclopentixol with 200mg/2wks i.m., so, if both drugs are metabolized through CYP2C19, which I couldn't find on the internet, that would explain it. Omeprazol is apparently metabolized through CYP2C19. Does anyone know?