The three active substances in Imprida HCT are anti-hypertensive medicines that are already in use in the European Union (EU).
Amlodipine is a ?calcium channel blocker?. It blocks special channels on the surface of cells called calcium channels, through which calcium ions normally enter the cells. When calcium ions enter the cells in the muscles of blood vessel walls, this causes contraction. By reducing the flow of calcium into the cells, amlodipine prevents the cells from contracting and helps the blood vessel walls to relax and widen, thereby reducing blood pressure.
Valsartan is an ?angiotensin II receptor antagonist?, which means that it blocks the action of a body hormone called angiotensin II. Angiotensin II is a powerful vasoconstrictor (a substance that narrows blood vessels). By blocking the receptors to which angiotensin II normally attaches, valsartan stops the hormone having an effect, allowing the blood vessels to widen and blood pressure to reduce. Hydrochlorothiazide is a diuretic. It works by increasing urine output, reducing the volume of fluid in the blood and lowering the blood pressure.
The combination of the three active substances has an additive effect, reducing the blood pressure more than the individual medicines alone. By lowering the blood pressure, the risks associated with high blood pressure, such as having a stroke, are reduced.