Add-on to Micamlo BP Trial

An Eight-week Randomised Double-blind Study to Compare the Efficacy and Safety of Telmisartan 80 mg and Amlodipine 5 mg and Hydrochlorothiazide 12.5 mg vs. Telmisartan 80 mg and Amlodipine 5 mg in Patients With Hypertension Who Fail to Respond Adequately to Treatment With Telmisartan 80 mg and Amlodipine 5 mg

This is a multi-centre, randomised, double-blind, active-controlled, parallel-group comparative trial to compare the fixed dose combination (FDC) of telmisartan 80 mg +hydrochlorothiazide 12.5 mg and amlodipine 5 mg (T80/A5/H12.5 mg) to telmisartan 80 mg+ amlodipine 5 mg (T80/A5 mg) in blood pressure lowering effect at week 8, the end of the double-blind period in essential hypertensive patients who fail to respond adequately to telmisartan 80 mg+ amlodipine 5 mg. Patients are assigned to one of the two groups after a 6-week open-label run-in period taking T80/A5 mg.

Inclusion criteria:

• Essential hypertensive patients who have already taking 2 or 3 antihypertensive drugs and mean seated diastolic blood pressure (DBP) must be >=90 and <=114 mmHg and mean seated systolic blood pressure (SBP) must be =<200 mmHg
• Able to stop all current antihypertensive drugs (other than study medication) from Visit 1b through the end of the trial without risk to the patient based on the investigator's opinion
• Age 20 years or older

Exclusion criteria:

• Patients with known or suspected secondary hypertension
• Patients with clinically relevant cardiac arrhythmia
• Congestive heart failure with New York Heart Association (NYHA) functional class III-IV
• Patients with recent cardiovascular events
• Patients with recent stroke events
• Patients with a history of sudden deterioration of renal function with angiotensin II receptor blockers or angiotensin converting enzyme inhibitors; or patients with post-renal transplant or post-nephrectomy
• Patients with hepatic and/or renal dysfunction
• Pre-menopausal women who are nursing or pregnant