Calaptin is used alone or together with other medicines to treat heart rhythm problems severe chest pain angina or high blood pressure hypertension High blood pressure adds to the workload of the heart and arteries If it continues for a long time the heart and arteries may not function properly This can damage the blood vessels of the brain heart and kidneys resulting in a stroke heart failure or kidney failure High blood pressure may also increase the risk of heart attacks These problems may be less likely to occur if blood pressure is controlled Calaptin is a calcium channel blocker It works by affecting the movement of calcium into the cells of the heart and blood vessels As a result Calaptin relaxes blood vessels and increases the supply of blood and oxygen to the heart while reducing its workload Calaptin is available only with your doctor s prescription