Hi, Allopurinol is not known to cause any chest heaviness and dizziness. Chest discomfort or heaviness is likely to be due to coronary artery disease. Golden test is coronary angiography (CAG) that you will be undergoing soon. You may undergo 2-D Echocardiography prior to CAG and it will give information about your cardiac function particularly LVEF (left ventricular ejection fraction) and any diastolic dysfunction,to account for your dizziness (low cardiac output,if any). Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Tushar Kanti Biswas, Internal Medicine Specialist