Amlodipine, also known as amlodipine benzenesulfonate tablets, is a calcium antagonist, a long-acting type of antihypertensive drug and a first-line, long-acting antihypertensive drug. Amlodipine relaxes blood vessels and lowers blood pressure by reducing the entry of extracellular calcium ions into the cells, and also reduces sodium retention thereby lowering blood pressure. Amlodipine has a strong antihypertensive effect. It is indicated for hypertension and chronic stable angina or vasospastic angina. Contraindications to the drug are hypersensitivity to amlodipine or other calcium channel blockers, severe hypotension. Adverse reactions are headache, mild to moderate edema, fatigue, nausea, flushing, palpitations (rapid heartbeat, often accompanied by panic) and dizziness. As amlodipine is a long-acting antihypertensive drug, the frequency of medication is usually once a day, which can improve medication adherence for the elderly, and the chance of missing a dose will be greatly reduced. Regularity of medication helps to better control blood pressure and reduces the likelihood of complications. The medication must be taken under the guidance of a medical professional.