What is Calaptin 40 mg tablet? Calaptin 40 mg is recommended to treat angina (heart or chest pain), high blood pressure, and some types of irregular heartbeats (arrhythmia). It functions by relaxing blood vessels to reduce blood pressure. This helps to lower the workload of the heart. Calaptin 40mg medicine is a calcium channel blocker. It prevents the action of calcium on the heart and blood arteries, thereby expanding the blood vessels and allowing more blood and oxygen to flow to the heart. This come down the blood pressure and prevents the chances of angina. Calaptin 40 mg tablet is recommended for: Arrhythmia Angina Hypertension