Amlodipine is used to treat high blood pressure (hypertension) and severe pain in chest.
Atenolol is used to control high blood pressure (hypertension), prevent chest pain (angina), treat uneven heart beats (arrhythmias) and in the early treatment following a heart attack (myocardial infarction).
Amlodipine belongs to a class of drugs called calcium channel blocker. It reduces the amount of calcium that enters the smooth muscles of the blood vessels and heart. As muscle cells require calcium to contract, reducing the flow of calcium causes the muscle cells to relax and blood vessels to dilate, reducing blood pressure, force and rate of the heartbeat. It improves blood and oxygen supply to the heart muscles.
Atenolol belongs to class of medications called beta blockers. It acts by blocking receptors (beta-1 adrenergic receptor) in the heart and peripheral blood vessels resulting in slowing of heart rate and relaxing of blood vessels thereby lowering blood pressure. Atenolol reduces oxygen requirement at any level of activity making it useful for long-term management of heart attacks caused by restricted blood flow to the heart.