Combination of Telmisartan 80 mg Plus Hydrochlorothiazide 12.5 mg to Telmisartan 80 mg in Patients Failed in Telmisartan 80 mg

Study Overview
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Brief Summary
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To demonstrate that a fixed dose combination of telmisartan 80 mg plus HCTZ 12.5 mg is superior to telmisartan 80 mg alone in patients, who fail to respond adequately to telmisartan 80 mg monotherapy, in lowering seated trough diastolic blood pressure after eight weeks of treatment.

Detailed Description
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This is a multi-centre, prospective, randomized, double-blind, parallel-group study in approximately 244 patients with a history of mild-to-moderate hypertensive who have been shown not to respond to telmisartan monotherapy. All patients will enter a one-week screening phase prior to starting the eight-week open-label T80 mg period. At the end of four weeks, only patients who fail to respond to T80 mg (DBP >= 90 mm Hg) will continue the treatment with T80 mg for another four weeks. At the end of eight weeks, only patients who fail to respond to T80 mg (DBP >= 90 mm Hg) will be randomized, double-blind, to receive either T80 mg alone or the fixed dose combination of T80 mg plus HCTZ 12.5 mg for eight weeks. Seated BP will be taken 24 hours post-dose at each visit. Labs, ECG, and physical examination will be done at screening, at baseline and at the final visit. Study Hypothesis: The primary objective of the study, showing that fixed dose combination is superior to telmisartan 80 mg alone will be tested using the hypotheses given below. H0: u T80/H12.5 - uT80 = 0 mm Hg versus H1: uT80/H12.5 - uT80 not equal 0 mm Hg, where uT80/H12.5 anduT80 represent the average reduction from baseline (Visit 4) in trough seated DBP for the fixed dose combination and telmisartan 80 mg, respectively. Testing of the null hypothesis will be performed using a two-sided test of significance at an a-level (type-I error rate) of 0.05. Comparison(s): The primary efficacy endpoint will be the change from baseline in seated DBP 24 hours post-dose at the last visit during the double-blind treatment phase. The pre-dose measurement on visit 4 will be viewed as the baseline measurement.

Official Title
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An Eight Week Randomized, Double-Blind, Double-Dummy Study Comparing a Fixed Dose Combination of Telmisartan 80mg Plus Hydrochlorothiazide 12.5mg to Telmisartan 80mg in Patients Who Fail to Respond Adequately to Treatment With Telmisartan 80mg.

Conditions
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Hypertension

Intervention / Treatment
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* Drug: Telmisartan/HCTZ
* Drug: Telmisartan


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: History of mild-to-moderate hypertension defined by a mean seated DBP >=95 and <= 109 mmHg before inclusion in the open-label phase Patients who fail to respond adequately to telmisartan monotherapy (mean seated DBP >= 90 mmHg) Participants between 18 and 80 years of age Ability to provide written informed consent Exclusion Criteria: Patients taking more than three anti-hypertensive medications at the screening visit. Pre-menopausal women (last menstruation 1 year prior to start of screening): Who are not surgically sterile (hysterectomy, tubal ligation) Who are NOT practicing acceptable means of birth control or who do NOT plan to continue using an acceptable method throughout the study (acceptable methods of birth control include IUD, oral, implantable or injectable contraceptives) Any woman: Who has a positive urine pregnancy test at screening (Visit 1) Who is nursing Hepatic and/or renal dysfunction as defined by the following laboratory parameters: SGPT(ALT) or SGOT(AST) greater than two times the upper limit of normal Serum creatinine > 3.0 mg/dL (or 265 mol/L) or creatinine clearance < 0.6 ml/sec Clinically relevant hypokalaemia or hyperkalaemia Uncorrected volume depletion Uncorrected sodium depletion Primary aldosteronism Hereditary fructose intolerance Biliary obstructive disorders, cholestasis or moderate to severe hepatic insufficiency Known or suspected secondary hypertension Bilateral renal artery stenosis; renal artery stenosis in a solitary kidney; post-renal transplant patients, presence of only one functioning kidney Congestive heart failure (NYHA functional class CHF III-IV) Unstable angina within the past three months Stroke within the past six months Myocardial infarction or cardiac surgery within the past three months PTCA within the past three months

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 80 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Intervention/Treatment |
| --- |
|Drug: Telmisartan/HCTZ|nan|
|Drug: Telmisartan|nan|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The primary efficacy variable is change from baseline in seated DBP at trough (24 hours post-dosing) after eight weeks of randomized treatment or at last trough observation during the double-blind phase (i.e. last trough observation carried forward). |  |  | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change from baseline in seated SBP, standing DBP and SBP at trough after eight weeks of randomized treatment or at last trough observation during the double-blind phase. The percentage of patients responding to the treatment. Safety. |  |  |