Conditions: Hypertension
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 529
Healthy volunteers: no

Brief summary:
The purpose of this study is to evaluate the effects on blood pressure control, pulse wave velocity, as well as safety and tolerability of felodipine single or combine with other drugs in Chinese Hypertension patients.

Detailed description:
In this study, investigators will choose male and female subjects aged between 35 and 79 years old with mild to moderate essential hypertension. At first 2 weeks, all patients will use felodipine 5mg daily. If the blood pressure dosen't meet the target (140/90mmHg), they will be randomized into metoprolol, lisinopril or hydrochlorothiazide combination groups for another 4 weeks therapy. After that, if the blood pressure has still not met the target, up-titrate the felodipine into 10mg, followed by a 4 weeks therapy. And if the blood pressure is still not met the target after that, up-titrate the combine drugs into maximum dosage. The whole treatment duration is 14 weeks.

The primary outcome is to evaluate the percentage of subjects reaching blood pressure target (defined as \< 140 / 90 mmHg) after 14 weeks treatment with felodipine sustained release in combination with metoprolol, lisinopril or hydrochlorothiazide.

Arms:
arm 1: None arm 2: None arm 3: None arm 4: None

Interventions: intervention 1: Felodipine tablet (Plendil) alone intervention 2: Felodipine tablet (Plendil)+Hydrochlorothiazide intervention 3: Felodipine tablet (Plendil)+Metoprolol tablet (Betaloc ZOK) intervention 4: Felodipine tablets (Plendil)+Lisinopril (Zestril)
Intervention descriptions: intervention 1: Felodipine sustained release tablet single drug therapy (1st week- 2nd week) Eligible subjects will first take felodipine tablet 5mg, once daily, orally for 2 weeks. If blood pressure is controlled after 2 weeks, then the subjects will continue the treatment until the end of primary therapy stage (14th week). intervention 2: Step 1: Eligible subjects will first take felodipine tablet 5mg, once daily, orally for 2 weeks.

If blood pressure is not controlled after 2 weeks, then the subjects will go to Step 2: Felodipine sustained release tablet 5mg once daily combined with hydrochlorothiazide 12.5mg, once daily. If blood pressure is not controlled after 4 weeks, then the subjects will go to Step 3: The dosage of felodipine sustained release tablet will be escalated to 10mg, once daily, while the dosage of the combined drug remains the same. If blood pressure is not controlled after 4 weeks, then the subjects will go to Step 4: The dosage of felodipine sustained release tablet keeps 10mg, once daily, while the dosage of different combined drug is doubled. intervention 3: Step 1: Eligible subjects will first take felodipine tablet 5mg, once daily, orally for 2 weeks.

If blood pressure is not controlled after 2 weeks, then the subjects will go to Step 2: Felodipine sustained release tablet 5mg once daily combined with metoprolol succinate prolonged-release tablet (Betaloc ZOK) 47.5mg , once daily. If blood pressure is not controlled after 4 weeks, then the subjects will go to Step 3: The dosage of felodipine sustained release tablet will be escalated to 10mg, once daily, while the dosage of the combined drug remains the same. If blood pressure is not controlled after 4 weeks, then the subjects will go to Step 4: The dosage of felodipine sustained release tablet keeps 10mg, once daily, while the dosage of different combined drug is doubled. intervention 4: Step 1: Eligible subjects will first take felodipine tablet 5mg, once daily, orally for 2 weeks.

If blood pressure is not controlled after 2 weeks, then the subjects will go to Step 2: Felodipine sustained release tablet 5mg once daily combined with Lisinopril (Zestril) 10mg, once daily. If blood pressure is not controlled after 4 weeks, then the subjects will go to Step 3: The dosage of felodipine sustained release tablet will be escalated to 10mg, once daily, while the dosage of the combined drug remains the same. If blood pressure is not controlled after 4 weeks, then the subjects will go to Step 4: The dosage of felodipine sustained release tablet keeps 10mg, once daily, while the dosage of different combined drug is doubled.

Protocol document: