Isolazine 20mg/37.5mg Tablet is used in the treatment of heart failure. It is a combination of two medicines that effectively control symptoms of heart failure. Isolazine 20mg/37.5mg Tablet should be taken with food regularly at a fixed time each day. You should take it regularly at evenly spaced intervals as per the schedule prescribed by your doctor. Taking it at the same time every day will help you remember to take it. The dose and duration of treatment will depend on what you are being treated for. Do not stop taking it until you have finished the complete course, even when you feel better. Lifestyle changes like a low-fat diet, exercise, and not smoking may help this medicine to work better.It is generally safe and suitable for most people but has some potential side effects. The most common side effects of this medicine include nausea, vomiting, diarrhea, low blood pressure, and loss of appetite. If these bother you or appear serious, let your doctor know. There may be ways of reducing or preventing them. It makes you feel dizzy as of orthostatic hypotension (sudden lowering of blood pressure on standing). Hence, rise slowly while from a sitting position or avoid driving. You may be asked for regular monitoring of blood pressure while on the treatment.Before taking this medicine, tell your doctor if you have liver or kidney disease. You must tell your doctor if you are pregnant, planning pregnancy, or breastfeeding. You should also let your healthcare team know all other medicines you are taking as they may affect, or be affected by this medicine.