Pathways

Amlodipine, trade name Norvasc, is a dihydropyridine calcium channel blocker (CCB) prescribed to treat hypertension and exertion-related angina. The drug acts directly on vascular smooth muscle to cause peripheral vasodilation. Amlodipine inhibits the influx of calcium ions into vascular smooth muscle and cardiac muscle to bind calmodulin. Inhibition of calcium bound calmodulin prevents activation of myosin light chain kinase and phosphorylation of the regulatory light chain subunit of myosin, this inhibits an integral part of muscle contractions. The net effect is decreased contractility of arterial smooth muscle and increased vasodilation resulting in a decrease in blood pressure. Amlodipine has arterial selectivity due to alternative splicing of the channel and has little effect on cardiac muscle.

Amlodipine, initially approved by the FDA in 1987, is a popular antihypertensive drug belonging to the group of drugs called dihydropyridine calcium channel blockers. Due to their selectivity for the peripheral blood vessels, dihydropyridine calcium channel blockers are associated with a lower incidence of myocardial depression and cardiac conduction abnormalities than other calcium channel blockers. Amlodipine is commonly used in the treatment of high blood pressure and angina. Amlodipine has antioxidant properties and an ability to enhance the production of nitric oxide (NO), an important vasodilator that decreases blood pressure. The option for single daily dosing of amlodipine is an attractive feature of this drug Label. Mechanism of action on blood pressure Amlodipine is considered a peripheral arterial vasodilator that exerts its action directly on vascular smooth muscle to lead to a reduction in peripheral vascular resistance, causing a decrease in blood pressure. Amlodipine is a dihydropyridine calcium antagonist (calcium ion antagonist or slow-channel blocker) that inhibits the influx of calcium ions into both vascular smooth muscle and cardiac muscle. Experimental studies imply that amlodipine binds to both dihydropyridine and nondihydropyridine binding sites, located on cell membranes. The contraction of cardiac muscle and vascular smooth muscle are dependent on the movement of extracellular calcium ions into these cells by specific ion channels. Amlodipine blocks calcium ion influx across cell membranes with selectivity. A stronger effect of amlodipine is exerted on vascular smooth muscle cells than on cardiac muscle cells Label. Direct actions of amlodipine on vascular smooth muscle result in reduced blood pressure. Mechanism of action in angina The exact mechanism by which amlodipine relieves the symptoms of angina have not been fully elucidated to this date, however, the mechanism of action is likely twofold: Amlodipine has a dilating effect on peripheral arterioles, reducing the total peripheral resistance (afterload) against which the cardiac muscle functions. Since the heart rate remains stable during amlodipine administration, the reduced work of the heart reduces both myocardial energy use and oxygen requirements. Dilatation of the main coronary arteries and coronary arterioles, both in healthy and ischemic areas, is another possible mechanism of amlodipine reduction of blood pressure. The dilatation causes an increase in myocardial oxygen delivery in patients experiencing coronary artery spasm (Prinzmetal's or variant angina) and reduces coronary vasoconstriction caused by smoking.

Amlodipine is heavily (approximately 90%) converted to inactive metabolites via hepatic breakdown with 10% of the parent compound and 60% of the metabolites found excreted in the urine. Ex vivo studies have shown that about 93% of the circulating drug is bound to plasma proteins in hypertensive patients Label. Characteristics that add to amlodipine's unique pharmacologic profile include nearly complete absorption, late-peak plasma concentrations, high bioavailability, and slow hepatic breakdown. (DrugBank)

Amlodipine is a calcium channel blocker used to treat hypertension and angina. It can be found under the brand names Amlobenz, Azor, Caduet, Dafiro, Exforge, Exforge Hct, Katerzia, Lotrel, Norliqva, Norvasc, Prestalia, Tribenzor, Twynsta and Viacoram. Amlodipine, initially approved by the FDA in 1987, is a popular antihypertensive drug belonging to the group of drugs called dihydropyridine calcium channel blockers. Due to their selectivity for the peripheral blood vessels, dihydropyridine calcium channel blockers are associated with a lower incidence of myocardial depression and cardiac conduction abnormalities than other calcium channel blockers. Amlodipine is considered a peripheral arterial vasodilator that exerts its action directly on vascular smooth muscle to lead to a reduction in peripheral vascular resistance, causing a decrease in blood pressure. Amlodipine is a dihydropyridine calcium antagonist (calcium ion antagonist or slow-channel blocker) that inhibits the influx of calcium ions into both vascular smooth muscle and cardiac muscle. Experimental studies imply that amlodipine binds to both dihydropyridine and nondihydropyridine binding sites, located on cell membranes. The contraction of cardiac muscle and vascular smooth muscle are dependent on the movement of extracellular calcium ions into these cells by specific ion channels. Amlodipine blocks calcium ion influx across cell membranes with selectivity. A stronger effect of amlodipine is exerted on vascular smooth muscle cells than on cardiac muscle cells. Direct actions of amlodipine on vascular smooth muscle result in reduced blood pressure. Some side effects of using amlodipine may include headaches, dizziness, flushing, and a pounding heart.

Ammonia can be rerouted from the urine and recycled into the body for use in nitrogen metabolism. Glutamate and glutamine play an important role in this process. There are many other processes that act to recycle ammonia. asparaginase recycles ammonia from asparagine. Glycine cleavage system generates ammonia from glycine. Histidine ammonia lyase forms ammonia from histidine. Serine dehydratase also produces ammonia by cleaving serine.