Fast heartbeat after chemotherapy needs to be treated with neurotrophic drugs and metoprolol tartrate tablets according to the cause. 1. The process of chemotherapy will affect the vegetative nerves, resulting in rapid heartbeat due to dysfunction, which needs to be treated with nerve-nutritional drugs, such as methylcobalamin dispersible tablets, vitamin B6 and so on. 2. If the rapid heartbeat is caused by arrhythmia, you need to take metoprolol tartrate tablets, betahistine hydrochloride tablets and other drugs for treatment, which can be improved soon. Fast heartbeat after chemotherapy may also be caused by blood pressure, too weak, etc. It is recommended to carry out a comprehensive examination and take targeted treatment in a timely manner, as well as to ensure adequate sleep.