The main objective of this study is to record, in routine clinical practice, patients' adherence to treatment with Perindopril/Indapamide/Amlodipine fixed dose combination, during 4 months treatment.

This is a non-interventional study aiming to record adherence to treatment with Perindopril/Indapamide/Amlodipine fixed dose combination. In parallel blood pressure levels will be recorded, as well as safety and tolerability of this fixed dose combination.

Inclusion Criteria:

• Male or female, ambulatory patients >18 years old.
• Clinically diagnosed essential arterial hypertension.
• Under treatment with Perindoril/Indapamide/Amlodipine fixed dose combination.
• The patient has given his/her written consent after being informed, before his inclusion in the study.

Exclusion Criteria:

• Secondary arterial hypertension.
• Serious end stage diseases, severe neuropsychiatric diseases, cerebrovascular event with serious residual lesions, scheduled procedure or surgical operation or hospital admission.
• Pregnancy, lactation or intention to become pregnant.

Greek patients with arterial hypertension who receive treatment with Perindopril/Indapamide/Amlodipine fixed dose combination.