High Dose BAYA1040_Nifedipine: a Dose-comparative Study

Inclusion Criteria: * 20 years or older * Japanese male or female * Outpatient with essential hypertension * Patients whose sitting diastolic blood pressure (DBP) is 90 mmHg or more despite more than 4 weeks of treatment with antihypertensive drug Exclusion Criteria: * Sitting diastolic blood pressure (DBP) is 110 mmHg or more or sitting systolic blood pressure (SBP) is 180 mmHg or more * Patients with secondary hypertension or hypertensive emergency