The degree of DDIs associated with omeprazole and clinical outcomes depend on factors such as genotype status of CYP2C19 and CYP1A2, ethnicity, dose and treatment course of precipitant omeprazole, pharmaceutical formulation of object drug eg, mycophenolate mofetil versus enteric- coated mycophenolate sodium, other concomitant medication eg, omeprazole- indinavir versus omeprazole indinavir ritonavir, and administration schedule eg, intensified dosing of mycophenolate mofetil versus standard dosing cialis and priligy