There are a number of precautions and warnings with metoprolol tartrate to be aware of. For example, metoprolol tartrate may cause extreme low blood pressure and/or a slow heart rate in some people. Also, metoprolol tartrate can potentially interact with a number of other medicines, so it is important to let your healthcare provider know (prior to taking metoprolol tartrate) about all of the drugs you're taking. Among the people who should not take metoprolol tartrate are those who have pheochromocytoma, serious heart failure, or certain types of irregular heart rhythms.
You should also tell your healthcare provider about all other medicines you may be currently taking, including prescription and non-prescription medicines, antacids, vitamins, and herbal supplements.