Dizziness with fast heart rate after stopping Betaloc (generic metoprolol tartrate) may be caused by sudden stopping of the drug or irregular life style. Sudden stopping of the drug will result in increased heart rate and dizziness, and irregular life style, such as irregular sleep, will also result in increased heart rate. 1. Sudden discontinuation: Metoprolol tartrate is a receptor blocker, treating a variety of premature beats and other arrhythmic diseases, and its effect is to slow down the heart rate and myocardial contractility. If the heart rate is slowed down and then the drug is suddenly stopped, it will cause an increase in the responsiveness of the heart rate, and there will be cardiac maladaptation, which will lead to dizziness;. 2. Bad habits: If the heart rate exceeds 100 beats per minute, it is heart rate increase, usually smoking, drinking alcohol, lack of sleep will affect the heart rate increase, feel dizzy. To develop good habits, regular sleep. If this situation is not relieved, it is recommended that you must go to a regular hospital for treatment.