Natcardine 100mg Tablet is a medicine used to treat arrhythmia (abnormal heart rhythm). It restores normal heart rhythm by blocking abnormal electrical signals in the heart. This helps to maintain a regular and steady heartbeat. Natcardine 100mg Tablet should be taken regularly as advised by the doctor. You should take it with food and at a fixed time. This medicine should not be stopped abruptly without consulting the doctor as this can worsen your condition. Regular follow-up with your doctor is advised while using this medicine. It may cause side effects like nausea, vomiting, low blood pressure, ringing in ear, headache and blurred vision. Your doctor may advise for regular monitoring of kidney function and blood sugar levels while you are taking this medicine. This medicine may not be suitable for some people. You must inform doctor if you are suffering from any liver or kidney disease. Also let your doctor know about all the other medications that you are using regularly. This medicine is not usually recommended during pregnancy or breastfeeding, so always consult your doctor before taking it.