Hypertension patient who satisfied below condition at Visit 1.

* patient who takes antihypertensive drug

* 140mmHg \<= MSSBP \< 200mmHg

* 130mmHg \<= MSSBP \< 200mmHg at or before visit 1(In high-risk patients)

* patient who doesn't take antihypertensive drug

* 160mmHg \<= MSSBP \< 200mmHg

Hypertension patient who satisfied below condition at Visit 2.

* 140mmHg \<= MSSBP \< 200mmHg at Visit 2

* 130mmHg \<= MSSBP \< 200mmHg at or before Visit 1(In high-risk patients)

Phase III Study to Evaluate the Efficacy and Safety of AGSAVI in Patients With Essential Hypertension Inadequately Controlled With AGLS