- Patient has had prescription or non-prescription drugs or other products known to be sensitive to cytochrome P450 (CYP)3A4 substrates or CYP3A4 substrates with a narrow therapeutic index, or to be moderate to strong inhibitors/inducers of CYP3A4 which cannot be discontinued 2 weeks prior to Day 1 of dosing and withheld throughout the study until 2 weeks after the last administration of AZD1775. Co administration of aprepitant or fosaprepitant during this study is prohibited