NCIt definition : The besylate salt of amlodipine, a synthetic dihydropyridine with antihypertensive
and antianginal effects. Amlodipine inhibits the influx of extracellular calcium ions
into myocardial and peripheral vascular smooth muscle cells, thereby preventing vascular
and myocardial contraction. This results in a dilatation of the main coronary and
systemic arteries, decreased myocardial contractility, increased blood flow and oxygen
delivery to the myocardial tissue, and decreased total peripheral resistance. This
agent may also modulate multi-drug resistance (MDR) activity through inhibition of
the p-glycoprotein efflux pump.;