This study is to test the efficacy and safety of the combination of olmesartan and amlodipine in hypertensive patients whose blood pressure is not adequately controlled with amlodipine alone

Inclusion Criteria:

• Without antihypertensive pre-treatment mean seated BP greater than 160/100 mmHg
• Pre-treatment with amlodipine 5 or 10 mg: mean seated BP greater than or equal to 140/90 mmHg

Exclusion Criteria:

• Secondary hypertension
• Any serious disorder which may limit the ability to evaluate the efficacy or safety of the test drugs

De-identified individual participant data (IPD) and applicable supporting clinical trial documents may be available upon request at https://vivli.org/. In cases where clinical trial data and supporting documents are provided pursuant to our company policies and procedures, Daiichi Sankyo will continue to protect the privacy of our clinical trial participants. Details on data sharing criteria and the procedure for requesting access can be found at this web address: https://vivli.org/ourmember/daiichi-sankyo/

Studies for which the medicine and indication have received European Union (EU) and United States (US), and/or Japan (JP) marketing approval on or after 01 January 2014 or by the US or EU or JP Health Authorities when regulatory submissions in all regions are not planned and after the primary study results have been accepted for publication.

Formal request from qualified scientific and medical researchers on IPD and clinical study documents from clinical trials supporting products submitted and licensed in the United States, the European Union and/or Japan from 01 January 2014 and beyond for the purpose of conducting legitimate research. This must be consistent with the principle of safeguarding study participants' privacy and consistent with provision of informed consent.