 Starting at the Month 1 visit, any subjects with uncontrolled blood pressure will be administered add-on therapy of HCTZ starting dose of 12.5 mg daily, that may titrate up to 25 mg daily andor amlodipine starting dose at 5 mg daily, that may titrate up to 10 mg daily. Any subject who receives add-on therapy must have their blood pressure checked within 2 weeks. Uncontrolled blood pressure may be treated by either increasing the add-on therapy dose or increasing the add-on therapy regimen to include both add-on drugs. Changes in add-on therapy require blood pressure checks within 2 weeks. 