A person with a fever may be given acetaminophen. Someone with an infection may need antibiotics or surgery. An individual with an arrhythmia may need heart medications to slow the heart rate, such as atenolol or lidocaine. Potential side effects depend on the treatments used. For example, antibiotics may cause allergic reactions or stomach upset.
Surgery can result in infection, bleeding, or allergic reaction to the anesthesia .
The heartbeat usually returns to normal after treatment of the cause. For example, when fever, infection, or pain are the cause, no further treatment for the rapid heartbeat is needed if these condition go away. Someone with congestive heart failure or diabetes , however, often needs lifelong treatment and monitoring. The speed of the heartbeat can be monitored closely if needed. This is done with special equipment that measures the electrical activity in the heart.