Heart conditions that are treated with generic Toprol medication are serious, thus your local physician will need to be consulted prior to use of the drug. The following conditions will need to be discussed during the consultation as they may be problematic in using this specific treatment option: pheochromocytoma, congestive heart failure, diabetes, depression, thyroid problems, circulation problems, asthma, low blood pressure, bronchitis, liver disease, emphysema, kidney disease, or myasthenia gravis. Also, pregnant and breastfeeding women should discuss the decision with their personal physician. While using this medication, a patient should not engage in activities that require concentration, such as driving or operating dangerous machinery.