Overview

Effect of Amlodipine on Anti-platelet Drug Effect in Patients With Coronary Artery Disease

Status:
Completed

Trial end date:
2011-04-01

Target enrollment:
0

Participant gender:
All

Summary

Clopidogrel can reduce risk of cardiovascular disease by inhibiting platelet aggregation. It is metabolized to an active drug by a liver enzyme. Its efficacy may be measured by blood sampling for platelet activity, analyzed by VerifyNow device. Calcium Channel blocker (CCB) is also commonly used for blood pressure and anginal control in these patients. Dihydropyridine group of calcium channel blocker (e.g. amlodipine) inhibits this enzyme. There are observational studies reporting dihydropyridine CCB reducing clopidogrel effect, but the clinical implication is unclear. This study test the hypothesis that there is no significant effect of dihydropyridines CCB on clopidogrel response compared with control. After giving consent, patients with suboptimal blood pressure or anginal control will be randomized to receive either dihydropyridine CCB or non-CCB as placebo. These patient will be follow-up in 1 month.

Phase:

Phase 4

Accepts Healthy Volunteers?

Details

Lead Sponsor:

Ruttonjee Hospital

Treatments:

Amlodipine
Calcium Channel Blockers
Clopidogrel

Criteria

Inclusion Criteria:

- ischemic heart disease patient, and

- given loading or maintenance dose of clopidogrel and in need of it for 1 or more month

- and in need of additional drug for optimal BP control (aim blood pressure <130/90) or
angina control.

Exclusion Criteria:

- existing use of amlodipine

- thrombocytopenia

- end stage renal failure

- allergy to clopidogrel/ amlodipine

- pregnancy/ lactation

- strong inhibitor or inducer of cytochrome P450 3A4 enzyme within 7 days before start
of the study.