Cardiac CTA is clinically known as coronary CTA, and Betalucel is the trade name abbreviation for metoprolol tartrate (short-acting preparation) and metoprolol succinate (long-acting preparation). A regular and slow heart rate (less than 70 beats/minute) is in principle required for a cardiac CTA. If you were taking Metoprolol Tartrate and Metoprolol Succinate prior to the cardiac CTA, it is possible to continue taking them. Sudden discontinuation of the medication may result in a reflexive increase in the heart rate and may even interfere with the examination. If Metoprolol Tartrate and Metoprolol Succinate have not been taken before and the heart rate is found to be too fast, more than 70 beats/minute before the cardiac CTA is performed, you can take one half or one tablet of Metoprolol Tartrate to help complete the examination. Do not take Metoprolol Tartrate and Metoprolol Succinate with a heart rate below 60 beats per minute. Contraindications to metoprolol tartrate or metoprolol succinate include cardiogenic shock, sick sinus node syndrome, third-degree atrioventricular block, and patients who are allergic to this drug. Adverse reactions include headache, bradycardia, abdominal pain, shortness of breath. The drug should be used in accordance with medical advice.